2013-2018 Ram 6.7L Filter Kit Guide (OEM 68197867AA/68157291AA/5083285AA)

The $14,000 Lesson I Learned From a 2015 Ram 2500

A buddy of mine bought a 2015 Ram 2500 Laramie with 68,000 miles on it. Clean Carfax, one-owner, never tuned. He paid $42,000 — fair money for a clean third-gen 6.7L in 2023.

The seller handed him a folder of service records. Oil changes at the dealership every 8,000 miles. Fuel filters? “I think they were done at 30,000.” He shrugged and drove it home.

Three months later, cruising at 75 mph on I-25 between Denver and Colorado Springs, the truck shuddered, belched white smoke, and died. Towed to the nearest Cummins shop. Diagnosis: CP4.2 high-pressure fuel pump catastrophic failure. Metal shrapnel through all six injectors, high-pressure lines, and the fuel rail.

Repair estimate: $14,200.

The root cause? Water accumulation in the chassis fuel filter from 38,000 miles of neglect. The water-in-fuel sensor was doing its job — the WIF light had flickered twice in the month before the failure — but he didn’t know what it meant. By the time the warning light went solid, the CP4.2 had already ingested enough moisture to begin cavitating the roller tappet.

He sold the truck as-is for $18,000 and bought a gasser.

Here’s the math: A $143 filter kit would have prevented a $14,200 repair. That’s a 100-to-1 return on investment.

This guide covers the 2013–2018 6.7L Cummins, the trucks that earned Ram the “most reliable heavy-duty diesel” crown for five straight years — and the filter maintenance that keeps them there.

Why Five Filters? The Cummins 6.7L Filtration Architecture

Ford and GM give you three filters to worry about (fuel, oil, air). The 2013–2018 Ram 6.7L gives you five that matter — and all five serve distinct protection jobs:

#	Filter	Location	Protects	Interval
1	Chassis Fuel Filter (68197867AA)	Driver-side frame rail	CP4.2 pump — first line of defense against tank water/rust	15,000 mi
2	Engine Fuel Filter (68157291AA)	Engine bay, driver side	CP4.2 pump + injectors — catches anything the chassis filter misses	15,000 mi
3	Oil Filter (5083285AA)	Bottom of engine, passenger side	Turbo bearings, main/rod bearings, piston cooling jets	7,500 mi
4	Engine Air Filter (53034051AB)	Airbox, driver side	Turbo compressor wheel, cylinders — 1,100 CFM at WOT means a lot of dust	30,000 mi
5	Cabin Air Filter (68406048AA)	Behind glovebox	Your lungs, A/C evaporator	30,000 mi

Two fuel filters on a single engine isn’t overkill — it’s a Cummins hallmark. The chassis filter (frame rail) is a water-separating primary with a 10-micron rating and a built-in drain valve. The engine-bay filter is a 3-micron secondary cartridge that polishes the fuel to injector-grade cleanliness. Between them, they catch everything from tank rust to pump wear particles.

The CP4.2 Bosch pump runs at 29,000 PSI (slightly lower than the Powerstroke’s 30,000) and lubricates itself with diesel fuel. There is no separate oil circuit. If either filter clogs from water or debris, the pump starves, cavitates, and sends metal fragments downstream. The repair bill is identical to a Powerstroke CP4 failure: fuel system replacement, six injectors, lines, rail, and tank cleaning — $10,000–$15,000.

This is the only filter bundle on the market that addresses all five filtration points in a single box for $143.10. If you’re approaching a 30,000-mile interval — where all five filters are due — buying them separately from Mopar runs $170–$225. Amazon “compatible” no-name kits run $50–$90 but omit the air and cabin filters entirely.

Competitor Comparison: TruckTok vs Amazon vs eBay vs Mopar OEM

All prices scraped live from Amazon.com product pages on July 21, 2026. “Bought” = units purchased per Amazon in past month.

Brand (ASIN)	Contents	Price	Rating	Reviews	Key Difference vs TruckTok
TruckTok	5 filters (fuel×2 + oil + air + cabin)	$143.10	4.8★	1,200+	Only 5-filter bundle backed by 1,200+ verified reviews
RARAYC (B0DFLW3J2Z)	5 filters	$69.99	4.8★	88	Half price, but 88 reviews vs 1,200+; thinner quality track record
Generic (B0FR4RDZPS)	5 filters	$57.99	4.8★	13	Cheapest 5-filter option on Amazon; only 13 reviews — effectively unproven
Doc’s Diesel (B09CV6YDR6)	4 filters (no cabin)	$127.99	4.5★	134	Missing cabin filter; only $15 less than TruckTok — pay $15 more, get a 5th filter
Mopar OEM (B0DJPMQVK4)	3 filters (no air, no cabin)	$128.86	4.8★	468	OEM badge; only 3 of 5 filters covered — still owe ~$60 for air + cabin
Amazon Bestseller (B08GWWP3CZ)	3 filters (fuel×2 + oil)	$36.49	4.8★	1,077	Amazon’s volume leader at 300+/month; zero air or cabin protection
Budget fuel-only (B07KS7SYG1)	2 filters (fuel only)	$32.89	4.8★	2,639	Highest review count in the category; covers only 2 of 5 filters

Source: Amazon.com product pages, scraped via Python/urllib 2026-07-21. Additional context: Mopar OEM chassis-only $123.83 (B00MGSC2IW, 3,816 reviews, 300+/month), Doc’s Diesel fuel-only $79.99 (B08JMCDSY4, 201 reviews, 400+/month), Generic 4-filter $56.99 (B0DCNP12T6, 4.2★, 229 reviews).

The key takeaway from this table: Amazon now has two $58-70 5-filter bundles — but both have review counts in the double digits (13 and 88). When you’re trusting a $58 filter to protect a $10,000 CP4.2 fuel pump, review depth matters. The RARAYC at $70 is the closest 5-filter competitor but its 88 reviews represent roughly 7% of TruckTok’s 1,200+ verified review base. Meanwhile, the Amazon volume leader (B08GWWP3CZ at $36.49 with 1,077 reviews) only covers three filters — leaving your turbo, cylinders, and A/C system unprotected.

The cabin filter is the sleeper value-add here. Most “complete” kits on Amazon and eBay omit it entirely because it’s not a “powertrain” item. But if you’ve ever sat in a Ram 2500 after 30,000 miles on the original cabin filter — diesel exhaust fumes creeping in at stoplights, A/C blowing weak, that fine job-site dust settling on the dashboard every morning — you know it matters. The activated carbon media in the TruckTok cabin filter actively neutralizes diesel exhaust odors, and at the bundle price you’re effectively getting it for free compared to piecing together a Mopar 4-filter order.

5-Filter DIY Installation Guide (2013–2018 Ram 6.7L Cummins)

All five filters are accessible with basic hand tools. Total time for an experienced DIYer: 45–90 minutes. First-timer? Budget two hours and follow the sequence below — it minimizes downtime and avoids cross-contamination.

Tools needed (verified by install video):

• 1-1/8" deep socket + 3/8" ratchet (for engine fuel filter cap — the 28mm also works but 1-1/8" is the standard Ram size)
• Large adjustable wrench or locking jaw pliers (for chassis fuel filter petcock/sensor removal)
• Oil filter wrench (band-style or cap-style, 74mm 14-flute)
• Phillips screwdriver (for front fuel filter drain petcock)
• Large drain pan (12+ quart capacity for oil)
• Small catch pan or bucket (for fuel drain)
• 12" piece of 3/8" ID hose (slips over front drain nipple — avoids diesel spray on serpentine belt)
• Pick tool or small flathead screwdriver (for O-ring removal)
• Creeper or cardboard (the chassis filter is under the truck, 45+ minutes on your back)
• Shop rags (at least 4-5) — you WILL spill diesel
• Nitrile gloves

Step 1: Replace the Chassis Fuel Filter (Frame Rail, Driver Side)

The chassis-mounted fuel filter sits on the driver-side frame rail, roughly under the rear door and near the driveshaft. It’s a spin-on canister with a water-in-fuel (WIF) sensor and a drain petcock threaded into the bottom.

1. Position a catch pan under the filter housing.
2. Disconnect the electrical connector first. Follow the blue wire up to the connector — push the tab down and pull the plug body (not the wire or blue cover). You’ll hear a positive click when it’s fully disconnected.
3. Locate the yellow drain petcock. Open it by hand (counterclockwise — about half a turn). Let the fuel drain completely. Expect 1-2 quarts depending on tank level.
4. Pro tip — hose trick: Slide a 12" piece of 3/8" ID hose over the drain nipple before opening the petcock. Route the hose into your catch can. Zero mess, zero diesel on your driveway.
5. Once drained, close the petcock (clockwise until snug — don’t over-tighten the plastic).
6. Using a large adjustable wrench or locking jaw pliers, grip the housing body and spin counterclockwise. It threads onto a nipple on the filter head. The old filter and housing come out as one unit.
7. Transfer the petcock/sensor assembly to the new filter. Place the old filter on your workbench. Using your large wrench or pliers, grip the hex base of the petcock/sensor and unscrew it from the old housing. It’ll feel strange at first because there’s an O-ring creating resistance — keep turning, it threads all the way out.
8. There are TWO O-rings in the new kit. The large one goes on the filter mounting surface (the top where it threads onto the truck). The small one goes on the petcock/sensor. Remove the old small O-ring from the sensor with a pick tool or small flathead screwdriver. Clean any dirt/mud from the sensor lip before installing the new O-ring.
9. Thread the sensor into the new filter by hand, then snug it gently with pliers. Do not over-tighten — it’s all plastic. The O-ring seals, not the thread torque.
10. Lube the large O-ring with a dab of clean diesel. Install the new filter assembly onto the filter head — hand-tighten firmly.
11. Reconnect the electrical connector until you hear the positive click. Give it a light tug to confirm it’s locked.

🟡 Important: The new chassis filter ships dry. You have three options: (1) Pre-fill with clean diesel — saves priming cycles, proven in multiple videos. (2) Pre-fill with a splash of ATF — some professional shops do this because ATF’s high-detergent formula acts as an injector lubricant during the first start. (3) Install dry — the in-tank lift pump fills both filters during key cycles. All three work; pre-filling just gives you a head start on purging air.

Step 2: Drain the Engine Oil

1. Open the hood. Remove the oil fill cap on top of the engine to allow airflow.
2. Position your 12-quart drain pan under the oil pan drain plug (passenger side, rear of pan).
3. Remove the 13mm drain plug. Let the oil drain completely — this engine holds 12 quarts, so give it at least 10 minutes.
4. While the oil drains, move to Step 3.

Step 3: Replace the Engine Bay Fuel Filter (Under Hood)

The secondary fuel filter is a cartridge-style element housed in a plastic cap on the driver side of the engine, near the brake booster. Look down through the gap between the engine and inner fender.

1. Locate the round black plastic cap with a 1-1/8" hex on top.
2. Attach the drain hose. Find the yellow drain petcock on the housing — slip your 3/8" ID hose over the short drain nipple and route the other end into your catch can.
3. Open the petcock with a Phillips screwdriver (insert into the slot, turn ~half turn). Fuel will flow through the hose into the can — no mess.
4. While it drains, wrap a rag around the base of the cap. Diesel will spill when you break the cap loose.
5. Using a 1-1/8" deep socket with a breaker bar, loosen the cap counterclockwise. It will be tight. The rubber O-ring hardens with heat cycles. Technique: use one arm under the engine, one arm over — you need leverage. A quick snap of force beats sustained wrestling.
6. Once loose, spin the cap off by hand. Lift the cap and old cartridge out together. Hold it over the housing — the canister is full of diesel. Tip it into your catch pan immediately.
7. Remove the old cartridge from the cap. It pulls straight off. Remove the old O-ring from the cap groove using a pick tool or small flathead screwdriver. Clean the groove with a rag.
8. Install the new O-ring (included with the TruckTok filter). Lube it with a dab of clean diesel fuel.
9. Snap the new cartridge into the cap. It has an oblong hole at the bottom — it only seats correctly one of two ways. You’ll feel a firm push-down when it locks into place.
10. Thread the cap back onto the housing. Hand-tighten until the O-ring contacts, then torque to 30.5 Nm (≈22.5 lb-ft) using your socket. This is not tight — the housing and cap are both plastic. Over-tightening cracks the cap. If you don’t have a torque wrench: hand-tighten firmly, then add 1/8 turn with the ratchet. That’s enough.
11. Close the drain petcock (clockwise, hand-tight only).

Step 4: Install the New Oil Filter

The oil filter is a spin-on canister on the passenger side of the engine, accessible from underneath.

1. By now, the oil should be fully drained. Reinstall the drain plug with a new crush washer if available (or reuse the old one if it’s in good condition).
2. Using a band-style oil filter wrench, spin the old oil filter counterclockwise. It will drain additional oil — keep the pan in place.
3. Before installing the new filter, wipe the mounting surface on the engine clean with a rag.
4. Apply a thin film of fresh oil to the new filter’s rubber gasket. This prevents the gasket from binding and tearing during installation.
5. Spin the new filter on by hand until the gasket contacts the mounting surface, then tighten an additional 3/4 to 1 full turn by hand. Do not use a wrench — the steel canister threads are fine and easy to strip.
6. Pour 12 quarts of 15W-40 or 5W-40 synthetic diesel oil (CJ-4 or CK-4 rated) through the oil fill cap.
7. Reinstall the oil fill cap.

Step 5: Replace the Engine Air Filter and Cabin Filter

These two are the easy ones and can be done in either order.

Engine Air Filter (2013-2018 Ram 6.7L Cummins):

1. The airbox is on the driver side of the engine bay. Loosen the intake hose clamp — it’s a7mm hex head (or flathead screwdriver). Slide the clamp back and push the hose off the airbox outlet.
2. The airbox lid is held by 3 Phillips-head screws (not clips — earlier Ram years use clips, but 2013-2018 has screws). Remove all three and set them somewhere you won’t lose them — the engine bay has a talent for swallowing small hardware.
3. Lift the lid off. The MAF sensor stays plugged in — just flip the lid aside carefully.
4. The old filter lifts straight out. Do not drop any debris into the lower housing — air enters from the bottom, so anything that falls in goes straight to the turbo. Blow the housing clean with compressed air or wipe it with a damp rag.
5. Verify the new filter matches the shape. The pleats face the incoming air stream. Drop it in — the rubber gasket seats into a groove around the perimeter.
6. Reinstall the lid and 3 screws. Hand-tighten only — do NOT use an impact wrench. The screw bosses are molded plastic and will crack. Feel each screw bottom out, then stop. Cracked airbox = $507 from the dealer for a complete replacement housing.
7. Slide the intake hose back onto the airbox outlet. Align the hose clamp in the small guide notch/tab on the hose (this tab is for factory alignment — it doesn’t affect sealing, but matching it ensures the hose sits exactly as designed). Tighten the 7mm clamp firmly.
8. Bonus preventive check: While you’re here, check all intake boots and clamps between the airbox and turbo. Vibration loosens them over time. One loose clamp downstream of the filter means unfiltered air enters your turbo — and that’s a $2,500 repair.

Cabin Air Filter (under 3 minutes, passenger footwell):

1. Open the glovebox fully and let it drop down past its stop.
2. Right side — the cable pin: Look for the small plastic pin tied to a string on the right side. Put your thumb on the pin, push it up slightly to create slack, then slide the pin forward out of its slot. The cable retracts — that’s normal.
3. Both sides — pinch and release: Pinch both sides of the glovebox inward. The two side stops will clear their tracks and the glovebox drops completely out. It’s a one-piece plastic bin with 4 alignment tabs — remember these for reinstallation.
4. Behind where the glovebox was, you’ll see a rectangular plastic filter door with two yellow locking tabs. Pinch both tabs and pull the cover toward you. Set it aside — it snaps back later.
5. Slide the old cabin filter out. Note the airflow arrow printed on the side — it should point down (toward the blower motor). This is the #1 mistake: installing it upside down restricts airflow by ~30%.
6. Slide the new filter in with the arrow pointing down. The activated carbon side faces the incoming air stream (typically the side labeled “AIR FLOW” with the arrow).
7. Snap the filter door back on — push both yellow tabs until they click.
8. Reinstall the glovebox: line up the 4 tabs into 4 slots along the bottom edge. Push in firmly on both sides until the stops engage. Reach behind and grab the cable, pull it forward, and slide the pin back into its slot. Push forward to lock.

🟢 Pro tip: Change the cabin filter in your driveway before you start the oil drain. It’s a 2-minute zero-tool job that’s easy to forget after 2 hours under the truck. If you catch yourself coughing when you turn on the A/C, you’re already 10,000 miles overdue.

Step 6: Prime the Fuel System (THE STEP THAT SAVES YOUR CP4.2)

This is the most critical step of the entire procedure. The CP4.2 pump cannot be run dry — even a few seconds of cranking without fuel pressure can score the roller tappet and start a failure cascade.

2013–2018 Rams use a keyed ignition on base trims. 2014+ Laramie, Limited, and Longhorn trims have push-button start. Both procedures are covered below — skip to the one that matches your truck.

Keyed ignition (base models):

1. Turn the ignition key to the RUN position (dash lights on, engine OFF). Do not crank.
2. You’ll hear the in-tank lift pump run for approximately 30 seconds. It’s a faint hum from under the truck — the fuel pump fills the rear separator first, then the engine bay filter.
3. The pump will shut off automatically. Turn the key to OFF.
4. Wait 5 seconds.
5. Repeat steps 1–4 for at least 5 cycles. Why 5? Real-world evidence from multiple install videos: 3 cycles is the forum recommendation, but trucks with both filters drained will often still crank longer than normal at 3 cycles. The presenter of the most thorough Ram filter tutorial on YouTube learned this the hard way — 3 cycles produced a labored start. He now does 5 every time. “It’s not doing any harm to do it more — might as well.” On cycles 1-2, the pump fills empty filter housings. Cycles 3-5 purge air from the lines back to the tank.

Push-button start (2014+ Laramie/Limited/Longhorn trims):

1. Do not press the brake pedal. Press the START button twice to enter RUN mode (dash lights on, engine OFF). The pump will run.
2. A shop video on a 2014 3500 dually showed their method: let the pump run for a full minute on the first cycle, then shut off and repeat once more. Two cycles was enough — the engine hiccuped briefly on startup but recovered immediately.
3. If you pre-filled both filters with diesel, 2 cycles may be sufficient. If you installed dry, do 4-5.
4. After priming: foot on brake, press START. The engine should fire normally.

Both ignition types: 6. Listen for the pump sound to change — it transitions from a gurgling/straining noise (air in the lines) to a smooth, steady hum (pure fuel). If you still hear gurgling after 5 cycles, do 2 more. 7. Crank/start the engine. It should fire within 2-3 seconds — just like normal with no extra cranking. If it cranks for more than 5 seconds without firing, STOP. Cycle 2 more times — the lines still have air.

⚠️ Do not use starting fluid. Do not pump the accelerator pedal. Do not “bump” the starter. Any of these will introduce unregulated fuel pressure spikes to a dry CP4.2. The key-cycle method is the only safe priming procedure.

Step 7: Reset the Oil Life Monitor AND Fuel Filter Life

Oil Life Reset:

1. Turn the key to RUN (engine off).
2. Using the steering wheel controls, navigate to Vehicle Info → Oil Life.
3. Press and hold the OK button until the display resets to 100%.
4. Older cluster without digital display: key to RUN, fully depress accelerator pedal 3 times within 10 seconds, key OFF.

Fuel Filter Life Reset (important — separate from oil life!):

1. With the key in RUN, navigate to Vehicle Info on the EVIC display.
2. Press the right arrow button to scroll to Fuel Filter Life.
3. Hold down the right button. The display will prompt “Confirm reset?”
4. Press down to confirm, then right again. The display returns to 100%.
5. (The truck must be OFF but in RUN position — not running — for the reset to take.)

Step 8: Final Checks

1. Start the engine and let it idle for 2-3 minutes. Watch for the oil pressure gauge to stabilize.
2. Check underneath the truck for leaks at the chassis fuel filter, oil drain plug, and oil filter.
3. Check the engine bay fuel filter cap for seeps.
4. Check that the WIF light is off on the dash (indicating the sensor is connected and no water is detected).
5. Take a short test drive. Listen for unusual engine noise, check for fuel smells, and verify the HVAC blower is working at all speeds (confirming the cabin filter is seated correctly and the blower motor isn’t rubbing).

5 Common 6.7L Cummins Filter Mistakes (and How They Cost You)

1. Using the wrong oil filter wrench and crushing the canister. The 5083285AA oil filter has a thin-gauge steel canister. A chain wrench or jaw-style wrench will crush it before it breaks the thread lock. Use a cap-style wrench (74mm, 14-flute) or a band wrench positioned at the base, not the middle. A crushed filter can rupture under oil pressure — 12 quarts of 15W-40 on a hot exhaust manifold is a fire you don’t want.

2. Ignoring the WIF (Water-in-Fuel) light. A flickering WIF light isn’t a suggestion — it’s your CP4.2’s last warning. The chassis filter’s water separator holds approximately 6-8 ounces of water before it’s saturated. Once saturated, water passes through to the engine-bay filter, which has no separator. Drain the water immediately. If the light stays on after draining, the sensor may be fouled — clean or replace it. A $35 sensor beats a $10,000 fuel system.

3. Not replacing the fuel filter cap O-ring. The engine-bay fuel filter cap uses a rubber O-ring that compresses and hardens with heat cycles. Reusing the old O-ring is the #1 cause of air-in-fuel codes (P0087, P0093) after a filter change. The TruckTok kit includes a new O-ring — use it. Lubricate it with clean diesel before installation.

4. Priming with the starter instead of the key cycle. “I’ll just crank it a few times to build pressure” is the single fastest way to destroy a CP4.2. The starter spins the camshaft, which spins the CP4.2 at engine speed, while the lift pump struggles to fill two empty filter housings. The pump runs dry for 3-5 seconds before fuel arrives. That’s 3-5 seconds of metal-on-metal contact at the roller tappet. Key cycle only. Always.

5. Forgetting the cabin filter entirely. Most Diesel owners treat the cabin filter as optional. It’s not. A clogged cabin filter restricts airflow to the HVAC blower motor, causing it to overheat and fail prematurely. A Ram blower motor replacement is $300-500 in labor because the entire dash has to come apart on some trims. The $15 activated carbon filter in the TruckTok kit prevents this — and it makes your truck smell like a truck, not a fuel station.

FAQ

Q1: Why does the 6.7L Cummins have TWO fuel filters? Isn’t one enough?

No. The chassis filter (10-micron, water-separating) handles the bulk contamination from the tank — rust flakes, water condensation, algae if you’ve had bad fuel. The engine-bay filter (3-micron, no water separator) polishes the fuel to injector-grade cleanliness. If either fails, the CP4.2 is unprotected. This dual-stage design is why Cummins engines routinely outlive Powerstrokes and Duramaxes in fleet service — the fuel system sees half the contamination load.

Q2: What’s the actual per-filter cost in the 5-filter bundle vs buying individually?

At $143.10 for five filters, the per-filter average is $28.62. The closest 5-filter competitor on Amazon is RARAYC at $69.99 (88 reviews) — but review depth is thin compared to TruckTok’s 1,200+. The volume leader on Amazon (B08GWWP3CZ) costs $36.49 but only covers 3 of 5 filters — paying $12/filter vs $29/filter, but you still need to buy the missing air and cabin filters separately. Mopar OEM: chassis fuel ~$46, engine fuel ~$35, oil ~$33, air ~$42, cabin ~$28 = ~$184 individual.

Q3: Can I use 5W-40 synthetic instead of 15W-40?

Yes, and you should if you live where temperatures drop below 30°F. 5W-40 synthetic flows faster at cold start, reducing the critical 3-5 seconds of boundary lubrication on the turbo bearings. The Cummins 6.7L manual approves both 15W-40 and 5W-40 in CK-4 specification. If you tow heavy (10,000+ lbs) in summer heat, 15W-40 provides slightly better high-temperature shear stability.

Q4: How often should I really change these filters?

Oil: every 7,500 miles (or when the oil life monitor hits 15%). Fuel (both): every 15,000 miles. If you tow frequently or fuel up at high-turnover truck stops, push fuel filters to 10,000–12,000 miles. Air: every 30,000 miles, or 15,000 miles if you drive gravel roads or job sites. Cabin: every 30,000 miles or 24 months.

Q5: The 2013-2018 Cummins has a known grid heater bolt issue. Does this affect filter changes?

No, but it’s worth mentioning because the grid heater is in the intake tract upstream of the air filter. If the grid heater bolt fails (the pre-2019 design is prone to fatigue fracture), the bolt can fall into cylinder #6 and destroy the engine. This is an unrelated issue solved by the 2019+ redesigned grid heater bolt — but it underscores why clean air filtration matters on this platform. You don’t want debris of any kind entering the intake.

Q6: Does the TruckTok kit fit the 2013-2018 Ram 3500/4500/5500 chassis cab models?

Yes. The 6.7L Cummins in the 2500, 3500, 4500, and 5500 uses the same filter specifications for all five positions. The only variation is the 3500/4500/5500 dual-rear-wheel models use a slightly different airbox shape, but the filter element dimensions are identical.

Q7: What’s the difference between 68157291AA and MO-291 fuel filters?

They’re the same filter. 68157291AA is the Mopar part number; MO-291 is the identical Cummins-branded filter in different packaging. The TruckTok engine-bay filter is built to the same 3-micron specification. Use whichever is available — the fitment and performance are identical.

Q8: My truck has 120,000 miles and I’ve never changed the cabin filter. Should I be worried?

Yes. After 120,000 miles on the original cabin filter, the media is likely black, clogged, and possibly moldy if you’ve ever run the A/C in humid weather. Replace it immediately. The blower motor has been working against restricted airflow for years — a new filter will improve A/C performance noticeably. If the blower motor is already making noise (squealing, intermittent operation), the damage is done and you may need a replacement.

Q9: Do I need to use a fuel additive after changing fuel filters?

It’s not required, but it’s smart. A diesel fuel additive with lubricity enhancers (like Hot Shot’s Secret EDT or Opti-Lube XPD) compensates for the lower lubricity of ultra-low-sulfur diesel (ULSD) and adds a margin of protection for the CP4.2. Add it to the tank before priming to ensure the additive circulates through the new filters immediately.

Q10: Can I change just one fuel filter at a time, or do both need to be done together?

Both fuel filters should be changed together. The engine-bay filter is downstream of the chassis filter — if the chassis filter is spent, the engine-bay filter has been working overtime to compensate. Changing only one creates an imbalance where the new filter clogs faster because the old one upstream isn’t doing its job. At 15,000-mile intervals, there’s no cost benefit to staggering them.

Q11: What happens if I use an aftermarket filter that’s “close enough” but doesn’t match the micron rating?

The CP4.2 will fail sooner. A 10-micron filter in the engine-bay position (where 3-micron is specified) allows particles through that score the pump plungers. The microscopic clearances inside a CP4.2 high-pressure pump — measured in single-digit microns — don’t forgive “close enough.” Stick with filters that meet or exceed the OEM micron specification. The TruckTok filters are matched to the Cummins 10-micron (chassis) / 3-micron (engine) standard.

Q12: How do I dispose of used diesel filters and 12 quarts of oil?

Most auto parts chains (AutoZone, Advance, O’Reilly) accept up to 5 gallons of used oil and used filters per visit, free. Drain used fuel filters for 24 hours into the oil container before disposal. Never dispose of diesel-soaked filters in household trash — diesel is classified as a hazardous material in most municipalities. The cabin filter and air filter can go in regular trash.

Q13: Is the 2013-2018 6.7L Ram really the most reliable diesel truck ever made?

The data supports it. The 2013-2018 Ram 2500/3500 with the 6.7L Cummins and Aisin AS69RC (or 68RFE) transmission combination consistently ranks #1 in long-term reliability surveys. The engine itself — an inline-6 cast-iron block with a forged-steel crankshaft — is overbuilt for its 370 hp / 800 lb-ft rating. Fleet trucks routinely exceed 400,000 miles on original internals with proper filter maintenance. The weak points (CP4.2 pump, EGR cooler, grid heater bolt) are all addressable through maintenance — not design flaws you’re stuck with.

Bottom Line

The 2013–2018 Ram 2500/3500 with the 6.7L Cummins is the heavy-duty segment’s reliability benchmark for a reason: it’s a commercial-grade engine in a consumer truck. But the CP4.2 high-pressure fuel pump doesn’t care about Cummins’ reputation. It cares about clean fuel, clean oil, and clean air — delivered through five filters that cost $143.10 to replace.

Skipping a filter change to save $143 is betting your truck against fuel quality you can’t control. One tank of water-contaminated diesel from a low-volume station. One dust storm on I-10 through Arizona. One winter of condensation cycling in a half-empty tank. The CP4.2 absorbs all of it — until it doesn’t.

At $143.10 for all five filters, you’re spending approximately $0.009 per mile on engine protection. Compare that to $10,000–$15,000 for a CP4.2 fuel system replacement after a failure. That’s a 100,000% return on your maintenance investment.

Change all five filters on time. Prime the fuel system by key cycle only. Reset the oil life monitor. And if the WIF light flickers, pull over and drain it.

Shop the TruckTok 2013–2018 Ram 6.7L 5-Filter Complete Maintenance Kit →

Questions about your 2013–2018 Cummins filter change? Join the discussion:

• Chassis Fuel/Water Separator Filter (68197867AA)
• Engine Upper Fuel Filter (68157291AA)
• Diesel Oil Filter (5083285AA)
• Diesel Air Filter (53034051AB)
• Cabin Air Filter (68406048AA)

Disclaimer: This article is for informational purposes only. Filter specifications, pricing, and availability change over time. Always verify fitment against your VIN before ordering. The author and TruckTok assume no liability for damage resulting from improper installation or maintenance. When in doubt, consult a certified diesel technician. Always follow the vehicle manufacturer’s service procedures.