2025-2026 Ram 6.7L Cummins Fuel and Oil Filter Buyer’s Guide

The 2025 Ram Heavy Duty is a clean-sheet redesign — new body, new interior, new transmission, and a 6.7L Cummins that’s mechanically evolved from the 2019-2024 platform. What didn’t carry over? The filter part numbers.

If you’ve owned a 2013-2024 Ram diesel, every fuel filter and oil filter you memorised is wrong for the 2025-2026 trucks. Don’t feel bad — I did the same thing. I walked into a parts counter in January 2026, rattled off “68436631AA” with confidence, and got handed a filter that doesn’t even fit the housing.

The 2025-2026 Ram 6.7L re-engineered the entire filter system: the fuel filter housing is new, the oil filter cartridge design replaces the old spin-on, and everything lives topside in the engine bay. That last part is actually great news — but the part-number confusion is real.

Here’s what you actually need, what it costs, and why one box is better than buying two Mopar bags.

Why 2025-2026 Filters Are Completely Different From 2019-2024

If you’re coming from a 2019-2024 Ram 6.7L, unlearn what you know about filter part numbers. The 2025 refresh is a hard break.

The 2019-2024 trucks used filter part number 68436631AA for the fuel system and 5083285AA for oil. The 2025-2026 trucks use 68677800AA (fuel) and 68677810AA (oil). They are not cross-compatible. Even the housing diameters and O-ring profiles changed.

Here’s what actually happened under the hood:

Component	2019-2024 Ram 6.7L	2025-2026 Ram 6.7L
Fuel Filter Part #	68436631AA	68677800AA
Oil Filter Part #	5083285AA (spin-on)	68677810AA (cartridge)
Fuel Filter Access	Engine bay (top-load)	Engine bay (top-load)
Oil Filter Access	Underneath (spin-on canister)	Engine bay (top-load cartridge)
Fuel Filter Stages	Dual-stage (primary + secondary)	Dual-stage (primary + secondary)
Transmission	68RFE / Aisin AS69RC	ZF 8HP75 (Powerline)
Water Separator	Integrated in housing	Integrated in housing

The biggest practical change? The oil filter went from a spin-on canister under the truck — the kind where you’re lying on your back with diesel dripping down your forearm — to a top-load cartridge you swap from the engine bay. If you’ve ever done an oil change on a pre-2025 Ram, you understand why this matters. If you haven’t, trust me: it’s a genuinely meaningful improvement that saves about 20 minutes and a shirt.

But there’s a catch: because 2025-2026 is the newest platform, these filters are hard to find. One 2025 Ram owner documented going through three or four oil changes — at 5,000-mile intervals, that’s roughly 15,000-20,000 miles — without changing the oil filter at all, simply because he couldn’t locate the correct part. He was running fresh oil through a filter that had been in service for nearly 20,000 miles. Not by choice — by scarcity. Another owner in the fuel filter video confirmed Mopar-branded fuel filters at $173 + shipping from independent retailers, and dealer quotes of $500-800 for a fuel filter change alone.

The TruckTok kit solves both problems at once: it puts both correct part numbers in one box, ships free, and costs less than what the Mopar-branded fuel filters cost by themselves.

The ZF 8HP transmission is also worth noting. It’s the same 8-speed found in the Ram 1500 but uprated for torque capacity. The transmission fluid and filter service intervals are completely different from the old 68RFE, and that’s a separate maintenance item — this kit only covers engine oil and fuel filtration.

What’s Actually in the TruckTok R-26-01/26-02 Kit ($131.39)

Open the box and you get everything for one complete filter service:

• Primary fuel filter (water separator, 5-micron rating) — sits in the forward fuel filter housing
• Secondary fuel filter (NanoNet media, 3-micron rating) — sits in the rear fuel filter housing
• Engine oil filter (top-load cartridge, OEM-spec media and bypass valve) — replaces Mopar 68677810AA
• Complete O-ring kit — two O-rings for the fuel filter housing caps, one for the oil filter housing cap
• Drain plug crush washer (if applicable — verify against your specific build date)

That’s three filters, two part numbers, and every seal you need — one box, one price, one shipping charge.

Compare that to buying individually:

Item	Mopar OEM (Dealer)	Fleetguard (Gino’s Garage)	TruckTok Kit
68677800AA Fuel Filter Kit (dual-stage)	$173+	$173+	Included
68677810AA Oil Filter	$50-60	~$21	Included
O-rings for both housings	Included	Included	Included
Total	$223-233	~$194	$131.39
Shipping	Dealer pickup (or $12-18)	+ shipping	Free
Part numbers to track	2	2	1 (SKU R-26-01/26-02)
Separate orders	✓	✓	No — one box

A note on Fleetguard: Fleetguard is Cummins’ own filtration brand. The “Mopar” filter and the “Fleetguard” filter for the 2025-2026 Ram 6.7L are the same physical part — same factory, same media, same specs — with different branding and a wildly different price. Fleetguard direct is ~$21 for the oil filter; the same filter in a Mopar box at the dealer is $50-60. Even with Fleetguard pricing, you’re at ~$194 for both fuel and oil filters from two separate orders. The TruckTok kit saves you $62-102.

But the real advantage isn’t just the price. It’s not having to hunt. When 2025 Rams first hit the road, the filters were on backorder for two months — owners couldn’t get oil filters anywhere. One 2025 owner documented going through 3-4 oil changes (roughly 15,000-20,000 miles!) without changing the oil filter at all, because he simply couldn’t find the part. The Mopar filters were delayed due to packaging issues — not manufacturing, not QC, just packaging. Meanwhile, the truck was accumulating mileage with a filter that should have been swapped three times over.

Micron Ratings and Why They Matter for the High-Pressure Common-Rail System

The 2025-2026 Ram 6.7L Cummins utilizes a ultra-high-pressure common-rail (HPCR) fuel injection system operating at extreme pressures exceeding 30,000 PSI. While modern Cummins platforms step away from the infamous CP4.2 era, HPCR fuel pumps and precision injectors remain unforgivingly sensitive to contaminated fuel. Internal component clearances are measured in single-digit microns. A microscopic particle of rust, silica, or emulsified water can quickly score pump rollers, erode injector nozzles, and grenade an entire multi-thousand-dollar fuel system.

This is where the dual-stage filtration architecture earns its keep.

Stage 1: Primary Fuel Filter — 5 Microns + Water Separation

The primary filter is the first line of defence. It sits in the forward housing and performs two jobs simultaneously:

1. Mechanical filtration at 5 microns — catches the big stuff: rust from fuel station tanks, sand, scale, and larger particulate that would immediately clog the secondary filter
2. Water separation — diesel fuel naturally attracts moisture during storage and transport. Water in a high-pressure pump does two things: it eliminates the lubricity diesel provides, and it flash-boils under the pump’s 30,000+ psi internal pressure, creating vapour pockets that erode pump internals

The water separator uses a hydrophobic media barrier that forces water droplets to coalesce and drop into the housing’s collection bowl. When you drain the housing, you’re draining water that never made it to the secondary filter — much less the injectors.

Stage 2: Secondary Fuel Filter — 3 Microns (NanoNet)

The secondary filter is where the real precision happens. The NanoNet media — a synthetic depth-filtration material — traps particles down to 3 microns absolute. To put that in perspective: a human red blood cell is about 7 microns across. The secondary filter catches things less than half that size.

This matters specifically because modern high-pressure pump roller and piston mechanisms operate at tight enough that 5-micron particles can cause abrasive wear. By the time fuel reaches the secondary filter, the primary has already pulled out water and large debris. The secondary catches the sub-visible wear-causing particles before they enter the pump.

Why Both Stages Matter

A single-stage 5-micron filter would do the job — right up until it doesn’t. The problem is loading: a single filter processing everything (water, 5-micron, 3-micron) will plug faster and, when plugged, bypass unfiltered fuel entirely. The bypass valve is a safety feature (a plugged filter is better than a starved engine), but bypassed fuel is unfiltered fuel — and that’s exactly what destroys precision high-pressure fuel pumps and piezo injectors.

The dual-stage architecture means the primary handles water and coarse filtration while the secondary handles fine filtration. Neither filter gets overloaded, and the bypass scenario becomes far less likely within the recommended service interval.

Competitor Comparison: Mopar OEM, eBay, Doc’s Diesel, and TruckTok

As of July 28, 2026, here’s what the competitive landscape actually looks like for 2025-2026 Ram 6.7L filter kits:

	TruckTok R-26-01/26-02	Mopar OEM (Independent)	Mopar OEM (Dealer)	eBay UNBRANDED Combo	eBay UNBRANDED Fuel-Only
Price	$131.39	$173 (fuel only, + ship)	$220-260+	~$102 (+ shipping)	~$47 (+ shipping)
Includes Fuel Filter(s)	✅ Dual-stage	✅ Dual-stage	✅ Dual-stage	⚠️ Claimed	✅ Dual-stage
Includes Oil Filter	✅ Yes	❌ Separate ($45-60)	❌ Separate ($50-80)	✅ Yes	❌ No
Total w/ Oil Filter	$131.39	~$220-240	~$270-340	~$102 + ship	Need to buy separately
O-Rings Included	✅ Complete set	✅ With each filter	✅ With each	⚠️ Unknown	⚠️ Unknown
Micron Rating Verified	✅ 5μm + 3μm NanoNet	✅ OEM spec	✅ OEM spec	❌ Not stated	❌ Not stated
Reviews	Forum-verified	N/A (OEM)	N/A (OEM)	None	None
Accountability	✅ Warranty + support	✅ OEM warranty	✅ OEM warranty	❌ No-brand	❌ No-brand
Dealer Labour on Top	None (DIY)	None (DIY)	$500-800 for 30 min job	None (DIY)	None (DIY)

Breaking Down the eBay UNBRANDED Options

The eBay listings for 2025-2026 Ram filters are worth examining because they show up in search and the prices are tempting — but the details matter.

UNBRANDED 68677800AA + 68677810AA Combo (€94.47 / ~$102):

At first glance, this looks like a deal. Three filters for $102. But here’s what the listing doesn’t tell you:

• The seller is an unverified international account with no diesel-specific feedback history
• The micron rating isn’t stated anywhere on the listing — is this a 5+3-micron dual-stage set, or a single-stage fuel filter being sold as a “combo”?
• The O-ring count isn’t disclosed — if the kit ships without the right housing seals, you’re reusing old O-rings on a truck that sees 30,000+ psi fuel pressure
• Shipping is international with no guaranteed delivery window — and no recourse if the package disappears between continents
• If a no-brand filter collapses and sends media debris into your high-pressure fuel pump, you’re eating a $3,000-8,000 fuel system repair. There’s no company to call, no warranty to claim, no liability to assign

UNBRANDED Fuel-Only 68677800AA (€43.77 / ~$47):

This listing only covers the fuel filter and doesn’t include the oil filter. Add a Mopar 68677810AA oil filter at $45-60 and you’re at $92-107 — plus shipping for both orders. At that point you’re $25 away from the TruckTok kit, which gives you verified micron ratings, known O-ring count, and forum-backed support.

UNBRANDED Fuel-Only (Brazil Seller, R$258.94 / ~$47-50):

Same fuel-only limitation, plus a seller in a different hemisphere. If the package takes 28 days, you’re well past your service interval by the time it arrives — and that interval clock starts ticking the moment your truck rolls off the lot.

Mopar OEM: The Eye-Watering Reality

Verified pricing as of 2026: an independent Mopar parts retailer (Gino’s Garage) lists the fuel filter pair alone at $173 + shipping — and that’s before adding the separate oil filter ($45-60). Total: roughly $220-240 for all three filters from the cheapest non-dealer source. At a dealership parts counter, expect to pay more. At a dealership service bay, brace yourself: comments on the installation video cite dealer quotes of $500-800 for a 30-minute fuel filter change. For a job you can do in your driveway with a 28mm socket and a plastic bag.

If you buy the TruckTok kit at $131.39 and DIY the install, you’re saving $90-110 versus independent Mopar pricing and $370-670 versus dealership service. Over 150,000 miles (approximately 10 filter changes at 15,000-mile intervals, or 20 at the recommended 7,500-mile interval), that’s real money.

Doc’s Diesel

Doc’s Diesel is a legitimate, well-established filter retailer with a deep catalogue covering Ram Cummins applications. As of July 2026, they list over 682 results for 2025 Ram filters — including the exact Mopar OEM parts.

The catch: Doc’s sells Mopar-branded OEM filters, typically at 10-15% off dealer MSRP. Even with that discount, you’re paying near-Mopar prices for two separate part numbers. If you’re committed to Mopar-branded OEM filters and don’t mind paying the premium, Doc’s is a legitimate option. But if you want OEM-spec filtration in one box at one price with free shipping, the TruckTok kit covers the same ground for substantially less.

Top-Load Installation: How Both Filters Get Serviced From the Engine Bay

The 2025 redesign did something genuinely useful: it moved every serviceable filter to the topside of the engine bay. Fuel filter primary? Engine bay. Fuel filter secondary? Engine bay. Oil filter? Engine bay.

This isn’t a small quality-of-life improvement. On a 2013-2024 Ram 6.7L, changing the oil filter meant crawling under the truck with a filter wrench and a drain pan, wrestling a spin-on canister that’s been heat-cycled 300 times since the last change. On the 2025-2026, you pop the hood and everything is right there.

Here’s the step-by-step process:

Fuel Filter Replacement (Both Stages)

Based on a real 2026 Ram owner’s first fuel filter change at 7,400 miles. This is not a theoretical walkthrough — these are the exact tools, torque values, and pitfalls you’ll encounter.

Tools you’ll need: 28mm 6-point socket (1/2″ drive recommended), stubby extension, swiveling 1/2″ adapter (makes the rear housing angle workable), torque wrench, latex gloves, clean plastic shopping bags (2-3), bucket, clear hose (optional, for drain tube extension), Gorilla tape, step stool (even if you’re 6′4″), flashlight.

Step 1: Crawl underneath and locate the drain hoses
Behind the front axle, in front of the starter, two hoses are taped/banded together. These are your fuel filter drain lines. Optionally, slip a clear hose over them and tape it on — it lets you direct the fuel into a bucket instead of all over the axle. A piece of 1¼″ tubing works if you have it lying around.

Step 2: Open the drain valves (with extreme caution)
Back up top. You’ll see two yellow quarter-turn drain caps on top of each filter housing. The front one is easy to reach. The rear one is buried under formed 90° hard lines — you’ll need long fingers or a lot of patience. Turn each valve a quarter turn to open.

⚠️ CRITICAL WARNING: These drain valves have the water-in-fuel (WIF) sensor integrated into them. The manual’s closing procedure is: quarter turn to close → then continue another half turn to compress the seal. But there’s also a bold warning: if you over-compress the seal, you damage the valve and the sensor. You’re turning blind, by feel, with almost no leverage. And if you break it, you replace the entire assembly — valve + sensor — not just a seal. For a 2025-2026, that’s a dealer-only part. The video creator couldn’t actually tell how much he was turning the rear valve because he couldn’t see it and could barely reach it — he turned until it felt closed and stopped. Use your best judgment.

One more thing: the drain port inside each canister sits about ¼″-⅜″ above the bottom. You won’t drain 100% of what’s in there. If you have water, some will remain.

Also worth knowing: two different 2025 owners reported inconsistent drain behaviour between the front and rear valves. One had the front valve drain normally but the rear valve barely dripped — most of the fuel in the rear canister only came out when he removed the cap. Don’t assume both valves will behave identically.

Step 3: Remove the housing caps
28mm 6-point socket. Turn counterclockwise. The factory installs these with the O-rings dry, so they’ll fight you for every ¹⁄₁₆ of a turn until the O-ring clears the housing. A ½″ drive provides the leverage you need. Use a stubby extension with a swivel adapter for the rear housing — a straight socket won’t clear the overhanging connectors. There’s a 90° electrical plug and a quick-connect fitting with a wire clip that block your line of sight and your hand path to the rear housing.

Once the cap is loose, pause. With the drain valves open, air should enter the canister and more fuel will drain out. Wait for it.

Step 4: Extract the old filter (the plastic bag trick)
Pull the filter up about ¼″-½″. You’ll hear and feel a rush of fuel draining out of the filter media. Hold it there for ~15 seconds while it empties. Now here’s the problem: how do you grab a diesel-soaked filter out of a deep housing without spilling everywhere? The video creator’s solution: take a clean plastic grocery bag, turn it inside out, stick your hand in it, reach down, grip the filter, and fold the bag over it as you pull it out. Two drops spilled, not two ounces. Do this for both canisters.

At 7,400 miles, the first owner found visible grit in the bottom of both canisters. After just 7,400 miles. Let that sink in.

Step 5: Replace the O-rings (all three per housing)
Each filter housing has three O-rings: the red cap O-ring, a whitish-gray square-profile O-ring seated deep inside the housing, and the O-ring on the cap itself. The kit includes all of them. Replace them all — reusing old O-rings on a fuel system is false economy.

Lubricate every O-ring before installation. The cleanest way: take a sealed jug of oil (or diesel), flip it upside down, remove the cap, and swirl your finger on the cap’s inner surface. You get just enough oil without pouring any out. Use the product you’re sealing — diesel for fuel filter O-rings, clean engine oil for the oil filter O-ring. The factory O-rings were installed dry — which is why the caps were so hard to remove. In fact, multiple 2025 owners reported the factory O-rings were loose and possibly swollen when removed at 10,000 miles — another reason to always use the new O-rings in the kit. Lubricated O-rings slide in smoothly and won’t tear.

Step 6: Install the new cartridges
Drop each filter into its housing and push down. They pop into place distinctively — it’s an audible, tactile click. If it doesn’t click, it’s not seated. Front and rear cartridges are different stages (primary = water separator, secondary = final polish), so install the correct one in each housing.

Step 7: Reinstall the caps
Hand-thread first until the cap seats against the O-ring. Then use the socket to tighten. You’ll feel the cap bottom out — it’s obvious. Set your torque wrench to 22.5 ft-lbs and apply. In the video, the torque wrench clicked before either cap actually moved — meaning the O-ring resistance alone exceeds 22.5 ft-lbs once the cap is fully threaded. If the cap is bottomed out and you’re not cranking on it, you’re fine. This is a plastic-composite cap threading into a metal housing — overtightening is far more dangerous than undertightening.

Step 8: Close the drain valves
Quarter turn back to closed. Stop when the valve reaches its stop. The manual’s “additional half turn to compress the seal” instruction is essentially impossible to execute precisely — you can’t see what you’re doing, and you can’t get leverage. The video creator closed them to the stop and moved on. No leaks.

Step 9: Prime the fuel system
With the truck off, turn the ignition to RUN (not start). You’ll hear the fuel pump — it’ll sound like a dolphin chirping as it fills empty canisters. Let it run its 30-second cycle, then turn OFF. Wait 30 seconds. Repeat 3 times total. By the third cycle, the pump should sound normal again. If you ran the tank completely dry, you’d need the full three cycles; for just a filter change where only the canisters emptied, two may suffice — but three costs you nothing.

Step 10: Start the engine
The first start after a fuel filter change will take a moment — don’t panic. If it doesn’t catch within 15 seconds, stop cranking and wait 2 minutes before trying again (you don’t want to burn out the starter). Let it idle for at least 30 seconds after it fires to work the remaining air out of the lines. Shut it off, restart — it should fire instantly the second time.

Step 11: Reset the fuel filter life monitor
In the vehicle settings menu, navigate to Fuel Filter Life and hold OK to reset.

Step 12: Remove your drain hose setup and check for leaks
Don’t forget to remove the hose from the drain tubes. Check under the truck for any diesel drips. Check around both filter caps.

Real-world interval recommendation: The manual says 15,000 miles. The truck owner in the video changes at 7,500 miles after finding grit in both canisters at 7,400. If you fuel up at high-traffic truck stops (higher water accumulation risk), run biodiesel blends (B5-B20 attracts more moisture), or operate in humid or freezing climates, 7,500 miles is cheap insurance for a high-pressure injection system that costs thousands to replace.

Dealership cost check: Multiple comments in the video cited dealer quotes of $500-800 for a fuel filter change — a 30-minute job. Mopar-branded filters alone are $173 + shipping from independent retailers. At $131.39 for both fuel filters AND the oil filter from TruckTok, you’re paying less for three filters than the dealership charges for two — and doing it yourself in an afternoon.

Oil Filter Replacement

1. Warm the engine — Run it for 5 minutes if cold. You want the oil flowing (not thick like syrup), but don’t do this on a boiling-hot engine. Warm oil drains faster and carries more contaminants out with it
2. Drain the oil — Crawl underneath. The drain plug is a 3/8″ square drive — just insert your ratchet directly into the plug, no socket needed. Left to loosen. Use a 16-quart / 4-gallon drain pan minimum — this engine takes 12 quarts and it’ll gush fast if warm. Expect some splash; keep cat litter handy
3. Locate the oil filter housing — Top of the engine, driver’s side. It’s a black cylindrical housing marked “Fleetguard” — same OEM supplier as Cummins factory. 28mm hex on top
4. Remove the cap with a 28mm socket — Turn counterclockwise. Clean the housing area thoroughly first — you don’t want dirt falling into the open housing. The cartridge will stay on the shaft as you lift the cap
5. Pull the old cartridge off the shaft — It’s saturated with oil, so have a bucket or drain pan ready underneath. As you lift it out, you’ll hear oil gurgle down into the housing — that’s normal, it means the drain path is clear
6. Check the old O-ring left the housing — This is critical. The old O-ring on the cap must come out with the old filter. Shine a flashlight down there and confirm no O-ring was left behind. A double-stacked O-ring will leak catastrophically on startup
7. Remove the old O-ring from the cap — Use your fingernail or a plastic pick tool. Never use anything metal — you’ll score the sealing surface and create a permanent leak path
8. Lubricate both new O-rings — Coat the new cap O-ring and the new cartridge shaft O-ring with fresh oil. The cap usually has enough residual oil on it; dip your finger and spread it around the full circumference. A dry O-ring can pinch and tear during installation
9. Push the new cartridge onto the shaft — Align and push downward until you feel tangible feedback — an audible click when it’s fully seated. This is the most important step: never use the cap to seat the cartridge. Push it down by hand until it clicks, then verify it’s at the same height the old filter was
10. Reinstall the cap — Hand-thread first to avoid cross-threading. Then torque to 25 Nm / 18 ft-lbs. This is a composite (plastic) cap threading into an aluminium housing — overtightening will strip the threads or crack the cap. If you don’t have a torque wrench, mark the cap position with a paint pen before removal and tighten to the same position
11. Reinstall the drain plug — Righty tighty. Torque to 35 ft-lbs. The drain plug uses a captured O-ring — the filter kit does NOT include a replacement drain plug O-ring, so inspect yours carefully. If it’s compressed flat, cracked, or hardened, order a replacement before your next oil change (it’s usually a special-order item). Wipe the pan clean so you can spot any future leaks.
12. Pre-fill the canister (optional but beneficial) — There’s a genuine owner debate here. One 2025 owner skips pre-filling and reports no issues. Another specifically recommends it: after the new filter is fully seated (clicked into place but before reinstalling the cap), pour 2-3 quarts of fresh oil directly into the canister housing. This saturates the filter media before first start, reducing the few seconds of oil starvation while the system primes. Then install the cap. Both approaches work, but pre-filling is cheap insurance against a dry start — especially in cold weather when oil takes longer to circulate.
13. Add oil — 10 quarts initially through the fill cap, then wait 5-10 minutes for the oil to settle through the cartridge housing. Check the dipstick and top off gradually. Total capacity is 12 quarts (3 gallons). Pro tip from a 2025 owner: just buy three 1-gallon jugs and pour them all in. It’ll read slightly overfull at first, but after you run the engine and let it settle, the dipstick will land exactly at the full mark. Ram made the capacity match exactly three gallons — intentional or not, it means no measuring, no partial jugs.
14. Start the engine — Let it idle for 5 minutes. Watch for oil pressure building on the gauge. Then shut it off, check underneath for leaks at the drain plug and filter housing, and do a final dipstick check.

Oil weight note from two 2025-2026 Ram owners: Both independently confirmed the factory oil cap specifies 10W-30 for warm climates and 5W-40 for cold climates. One owner runs Valvoline Premium Blue 10W-30 (the oil endorsed by Cummins); another runs Shell Rotella T5 10W-30 in spring/summer/fall and switches to 5W-40 in winter. Both owners noted their factory oil at 5,000 miles still looked brown rather than coal-black, suggesting the factory fill held up well. If you tow heavy year-round, consider sticking with 5W-40 regardless of season — it gives you more thermal headroom.

Pre-filling note: Some owners ask if you should pre-fill the oil filter cartridge before installation. Neither video creator did — the filter drops into a housing that’s open to the sump, and pre-filling a cartridge with a funnel is awkward at best. Ram doesn’t specify it. Install it dry, add oil through the fill cap, and let the engine circulate. Check for leaks at the cap after the first idle.

Post-install check: After the engine reaches operating temperature, shut it off and run your finger around the oil filter cap seam. Any seepage means the cap O-ring didn’t seat correctly — back it off and re-torque.

Pro tip: The hood on 2025+ Rams is aluminium, so magnetic work lights won’t stick. Use a clamp-on or hook-style light.

Service Intervals

Filter	Interval (Miles)	Interval (Months)	Notes
Fuel Filter (Primary + Secondary)	15,000	12	Change both stages simultaneously; drain water separator every 5,000 miles or monthly
Oil Filter	7,500	6	28mm socket for cap; torque to 25 Nm / 18 ft-lbs. Use 10W-30 (warm) or 5W-40 (cold) CK-4 rated oil; 12 qt capacity

When to change fuel filters sooner: If you fuel up at high-traffic stations (more water accumulation), run biodiesel blends (B5-B20 attracts more moisture), operate in humid climates, or notice any hesitation under heavy throttle, change the fuel filters at 10,000 miles instead of 15,000.

5 Signs Your 2025-2026 Ram Needs a Filter Change Right Now

You don’t need to wait for the odometer to hit exactly 15,000 miles. The truck will tell you when the filters are overdue. Here’s what to watch for:

1. Hard starting or extended cranking — Fuel pressure takes longer to build when filters are restricting flow. If your truck cranks for 4-5 seconds before firing instead of the usual 1-2, restricted fuel filters are high on the differential diagnosis list

2. Power loss under load — You’re pulling a grade with a trailer and the truck feels like it’s running out of steam at 2,200 RPM. Clogged fuel filters restrict volume even before they trigger a dashboard warning. The CP4.2 can’t maintain rail pressure when supply volume drops

3. Water-in-Fuel (WIF) warning light — The dashboard warning for water in the fuel system means the water separator is saturated. Drain it immediately. If the light comes back within a few hundred miles, the filter media has absorbed enough water that the separator can’t function — change the primary filter

4. Fuel filter life monitor showing <10% — The 2025-2026 Rams have an onboard filter life monitor in the instrument cluster (navigate to Vehicle Info → Maintenance). It tracks mileage, fuel consumption, and duty cycle to estimate remaining filter life. When it drops below 10%, schedule the change

5. Oil pressure fluctuation at idle — If your oil pressure gauge is bouncing between 15-25 psi at a warm idle when it usually sits steady at 20, a partially restricted oil filter may be causing variable bypass valve activation. The bypass opens when the filter media is too plugged to flow at idle volume, and closes when RPM rises and differential pressure drops — creating the fluctuation pattern

One more to watch for on the 2025-2026 specifically: Because the oil filter is now a cartridge rather than a spin-on, a torn or improperly seated O-ring on the housing cap will cause a slow oil seep that pools on top of the engine. If you smell burning oil after a filter change, check the oil filter housing cap seal before you check anything else.

Why OEM-Spec Matters More Than OEM Branding

There’s a persistent belief in the diesel community that “Mopar-branded” and “OEM-quality” are the same thing. They’re not. Mopar is a brand — it’s Chrysler’s parts division. The filters inside Mopar boxes are manufactured by third-party filtration companies (Cummins Filtration/Fleetguard, Mann+Hummel, Donaldson) to Chrysler’s OEM specification. The spec is what matters, not whose logo is on the box.

TruckTok’s 68677800AA-replacement fuel filters and 68677810AA-replacement oil filter are manufactured to the same OEM specifications: same micron ratings (5+3 dual-stage), same media type (synthetic depth-filtration for fuel, cellulose-synthetic blend for oil), same bypass valve pressure ratings, same dimensional tolerances for housing fitment.

What you’re not paying for:

• The Mopar dealer markup (typically 30-50% over wholesale)
• The Mopar brand premium on the packaging
• Separate shipping on two different part numbers
• The convenience fee of walking into a dealership parts counter

What you’re getting: Three filters built to the OEM print, in one box, for less money than two Mopar bags.

This isn’t a knock on Mopar. But a fuel filter is a consumable — you’re replacing it every 15,000 miles (or 7,500 if you’re being smart about protecting your high-pressure fuel system). Over 150,000 miles, that’s 10-20 filter changes. At $173 for Mopar fuel filters alone (verified independent retailer pricing, July 2026) plus $45-60 for the separate oil filter — call it $220 minimum — that’s $2,200-4,400 in filters. At $131.39 per set from TruckTok, it’s $1,314-2,628. The $886-1,772 you save across the life of the truck buys a lot of diesel. Or extra maintenance supplies. Or both.

Frequently Asked Questions

1. Does this kit fit both the Ram 2500 and 3500?

Yes. The 6.7L Cummins in the 2025-2026 Ram 2500, 3500, 4500, and 5500 all use the same fuel filter (68677800AA) and oil filter (68677810AA). The engine and filter housings are identical across the HD lineup. The only differences are chassis, suspension, and axle components — the powerplant and filtration system are shared.

2. Is this the same filter as the 2019-2024 Ram?

No. The 2019-2024 Ram 6.7L uses fuel filter 68436631AA and oil filter 5083285AA. The housings, O-ring diameters, and filter cartridge dimensions changed for the 2025 redesign. These filters are not cross-compatible. If you try to install a 68436631AA in a 2025 housing, it won’t seat — and forcing it will damage the housing.

3. Can I buy just the fuel filter without the oil filter?

Currently, the TruckTok R-26-01/26-02 kit is sold as a complete set. If you only need the fuel filter (68677800AA replacement) or only the oil filter (68677810AA replacement), individual options may become available — check the product page or contact TruckTok support for current availability.

4. Does this void my warranty?

No. Under the Magnuson-Moss Warranty Act in the United States, a manufacturer cannot void your warranty for using aftermarket replacement parts that meet OEM specifications. TruckTok’s filters are manufactured to the same specifications as the Mopar-branded equivalents. If a dealership attempts to deny warranty coverage based on filter brand alone, they are required to prove the aftermarket part caused the specific failure — and a properly manufactured filter won’t cause one.

5. How do I know if I have the 2025 or 2026 model year?

This kit fits 2025 and 2026 Ram 2500/3500/4500/5500 with the 6.7L Cummins. The easiest way to verify is your 10th VIN character: ‘S’ = 2025, ‘T’ = 2026. You can also check the build date on the driver’s door jamb sticker. Trucks built after August 2024 are typically 2025 model year; after August 2025 are typically 2026.

6. What micron rating are these fuel filters?

The primary fuel filter (water separator stage) is rated at 5 microns. The secondary fuel filter uses NanoNet synthetic depth media rated at 3 microns absolute. This dual-stage architecture matches the OEM filtration specification and is designed to protect the high-pressure common-rail fuel pump and injectors from particle wear and water contamination.

7. Does the kit come with O-rings?

Yes. The kit includes all O-rings needed for both fuel filter housing caps and the oil filter housing cap. Each O-ring should be replaced every filter change — reusing old O-rings risks fuel or oil leaks under pressure. The O-rings are pre-lubricated in packaging but should be re-coated with clean diesel (fuel filter O-rings) or fresh engine oil (oil filter O-ring) before installation.

8. Is the oil filter a spin-on or cartridge?

The 2025-2026 Ram 6.7L uses a top-load cartridge oil filter — not the spin-on canister design found on 2013-2024 Rams. This is one of the biggest serviceability improvements of the redesign. You access the oil filter housing from the top of the engine bay, remove the cap with a socket wrench, lift out the old cartridge, and drop in the new one. No drain pan wrestling, no filter wrench, no oil dripping down your arm.

9. What oil should I use with this filter?

Ram approves two weights for the 2025-2026 6.7L Cummins: 10W-30 for warm climates and 5W-40 for cold climates. These are the only two weights — don’t experiment with alternatives. The factory fill is widely believed to be Valvoline Premium Blue, which is the oil endorsed by Cummins. Total capacity is 12 quarts (11.4 litres) with filter change. Popular CK-4 rated options include Valvoline Premium Blue 10W-30, Shell Rotella T6 5W-40, and Amsoil Heavy Duty Diesel 5W-40. One 2026 owner who did his first change at 5,000 miles noted the factory oil still had a brown tint — not coal-black — suggesting the factory fill and filtration held up exceptionally well.

10. How long does shipping take?

TruckTok processes orders within 24 business hours. Free standard shipping is included, and expedited shipping options are available at checkout. Delivery times vary by location — typically 3-7 business days for the continental US. International shipping availability depends on destination; check the product page for current international shipping options.

11. What if the filter doesn’t fit my truck?

TruckTok offers a 30-day return policy. If the filter doesn’t fit, contact support for a return authorisation. To avoid issues, verify your VIN’s 10th character before ordering: ‘S’ = 2025, ‘T’ = 2026. This kit only fits the 6.7L Cummins — it does not fit the 6.4L Hemi gas engine, which uses entirely different filters.

12. Can I install these myself?

Absolutely. All three filters are top-load cartridge designs accessible from the engine bay. The only tools you’ll need are a socket wrench (28mm or 32mm socket — verify your specific truck), a pick tool or small flathead for O-ring removal, clean diesel for O-ring lubrication, and a catch container for draining the water separator. No lift, no jack stands, no crawling underneath. Budget about 45 minutes for your first time doing all three filters; 20-25 minutes once you know the procedure.

13. Why does the fuel filter include two cartridges?

The 2025-2026 Ram 6.7L Cummins uses a dual-stage fuel filtration system. The primary filter (5-micron, forward housing) handles water separation and coarse filtration. The secondary filter (3-micron NanoNet, rear housing) handles fine filtration before fuel reaches the high-pressure injection pump. Both stages must be replaced together every 15,000 miles / 12 months. The TruckTok kit includes both cartridges.

Maintenance Schedule: 2025-2026 Ram 6.7L Cummins at a Glance

Service	Interval	Filter Part	Notes
Oil + Filter Change	Every 7,500 mi / 6 months	68677810AA (oil filter)	Use 5W-40 CK-4/CJ-4 full synthetic
Fuel Filter Change	Every 15,000 mi / 12 months	68677800AA (dual fuel filter)	Change both primary and secondary simultaneously
Water Separator Drain	Every 5,000 mi / monthly	N/A (drain, don’t replace)	More often in humid climates or with biodiesel
Air Filter Inspection	Every 15,000 mi	Engine air filter	Replace when visibly dirty or per restriction gauge
CCV Filter	Every 60,000-75,000 mi	CCV filter cartridge	Often overlooked — a clogged CCV filter pressurises the crankcase
Transmission Fluid + Filter	60,000 mi (severe duty) / 120,000 mi (normal)	ZF 8HP service kit	Critical for ZF 8HP longevity — don’t skip

Pro tip: The oil filter and fuel filter intervals don’t naturally align (7,500 vs. 15,000 miles). The easiest rhythm is: change oil + oil filter every 7,500 miles, change fuel filters every other oil change. That way your fuel filters get done at 15,000, your oil at 7,500 and 15,000, and you’re never doing a fuel filter service on its own separate trip.

What the 2025-2026 Ram Community is Saying

The 2025-2026 Ram HD platform is still young — delivery volumes ramped up through 2025, and by mid-2026 there’s a growing owner community working through the teething phase of a new generation. Here’s what’s emerging from forum discussions and owner groups:

• Filter availability is improving but still inconsistent. Some dealerships stock 68677800AA and 68677810AA; others are special-ordering with 5-10 day lead times. Online retailers are increasingly the faster option
• The ZF 8HP is well-received but transmission fluid service is expensive. Plan for $400-600 for the 60K-mile transmission service at a dealer. Some owners are DIY’ing it with the ZF Lifeguard 8 fluid, but the fill procedure requires the transmission to be at a specific temperature (monitored via scan tool) — it’s not a driveway drain-and-fill
• Top-load oil filter is universally praised. The single most-mentioned quality-of-life improvement over the 2019-2024 platform. Nobody misses the spin-on canister
• High-pressure fuel system concerns are real but manageable. While the 2025-2026 Cummins platform features updated fuel injection hardware, the fundamental vulnerability of modern high-pressure diesel systems — severe sensitivity to water and abrasive micro-contaminants — hasn’t changed. Proper dual-stage fuel filtration with on-schedule filter changes remains your best defence

[IMG: 2025 Ram 3500 dually with fifth-wheel trailer — lifestyle shot showing the truck in use, context for the filter maintenance discussion]

Legal Disclaimer

The information in this article is provided for educational and informational purposes only. While every effort has been made to ensure accuracy, specifications, part numbers, service intervals, and pricing are subject to change by the manufacturer. Always consult your vehicle’s owner’s manual and follow the manufacturer’s recommended maintenance procedures.

Aftermarket replacement parts are not affiliated with, endorsed by, or sponsored by FCA US LLC, Stellantis, Cummins Inc., or Mopar. The part numbers 68677800AA and 68677810AA are registered trademarks of their respective owners and are referenced solely for fitment identification purposes.

This article does not constitute professional mechanical advice. If you are not comfortable performing your own vehicle maintenance, consult a qualified diesel technician. Improperly installed filters can cause fuel system damage, oil starvation, and engine failure.

TruckTok makes no claims regarding emissions compliance. Some filter products may be intended for off-road or competition use only. Verify local, state, and federal regulations before installing aftermarket components on emissions-controlled vehicles.

Product pricing is accurate as of July 28, 2026, and is subject to change. eBay and Doc’s Diesel pricing is based on publicly available listings and may not reflect current availability.

Ready to Save $62-102 on Your Next Filter Service?

The 2025-2026 Ram 6.7L Cummins is a different truck from anything that came before it — and the filter ecosystem is part of that difference. If you’re still buying 68677800AA and 68677810AA separately at dealer pricing, you’re spending more money and tracking more part numbers than you need to.

The TruckTok R-26-01/26-02 kit gives you both fuel filter stages and the oil filter in one box, with every O-ring, at a price that beats separate Mopar purchases by $62-102 — and it ships free to your door.

Need installation help? The TruckTok forum has dedicated step-by-step guides with photos:

• 2025-2026 Ram Fuel Filter Replacement (68677800AA)
• 2025-2026 Ram Oil Filter Replacement (68677810AA)

🛒 Shop the R-26-01/26-02 Dual Fuel & Oil Filter Kit — $131.39

💬 Questions about fitment or installation? Check the TruckTok Forum or join the discussion — there’s a growing community of 2025-2026 Ram owners working through the same maintenance questions.