2014-2019 EcoDiesel Fuel + Oil Filter Guide (68235275AB / 68229402AA)

The $16 Filter That Could Have Cost Me an Engine

My 2016 Ram 1500 EcoDiesel hit its first fuel-filter service around 40,000 miles. I searched “EcoDiesel fuel filter” and found a “fuel + oil filter kit” for $16.49. The title said “fits 2014-2019 Ram 1500 3.0L EcoDiesel.” The picture showed two boxes. Four stars. I ordered it.

It fit. That was the problem — it fit, so I assumed it worked. What I did not know then is that the EcoDiesel’s fuel filter is not just a paper strainer. It is a fuel/water separator, and its entire reason for existing is stripping water out of diesel before that water reaches the high-pressure common-rail pump. The $16 filter had a fuel element and nothing else — no meaningful water-separation media, no third-party micron rating, no way to tell what was actually inside the can.

The 3.0L EcoDiesel runs a common-rail injection system that can spike over 30,000 PSI. The injectors and the high-pressure pump are machined to tolerances measured in microns, and they are lubricated by the fuel itself. Water in that fuel is not a slow-wear problem — it is a “new high-pressure pump and eight injectors” problem, and that repair runs well into four figures on a truck that is only worth so much.

I got lucky. I caught it on the next service before anything failed. But it taught me the lesson that matters on this platform: the EcoDiesel’s fuel filter is the last line of defense between a $4-a-gallon tank of diesel and a common-rail fuel system that costs more than the truck is worth to repair.

Why the 2014-2019 EcoDiesel Filter Is Different

There are two generations of the 3.0L EcoDiesel, and they do not share filters. Get this wrong and you will not get a warning light — you will get a destroyed fuel system.

Generation 1 (2014-2019): the 68235275AB fuel filter. The first EcoDiesel used a fuel/water separator cartridge, part number 68235275AB (superseding the original 68235275AA). It is a 3-micron filter whose job is twofold: strip water out of the diesel, and catch the fine particulate that scores the high-pressure pump. The oil filter is the 68229402AA — a cartridge-style element that sits in a housing under the engine cover.

Generation 2 (2020+): the 68436631AA fuel filter. In 2020, FCA redesigned the EcoDiesel, and both filters changed. The new fuel/water separator is 68436631AA, and the new oil filter is 68507598AA. These are physically different parts.

Here is why that matters, in plain terms:

1. A 2020+ filter does not fit a 2014-2019 truck properly. The housings are different. A filter that “almost” threads in is worse than one that does not thread in at all, because it can hold just long enough to let unfiltered fuel past before it fails.
2. The part numbers look similar and sellers get them mixed up. 68235275AB and 68436631AA are both “EcoDiesel fuel filters.” A careless Amazon or eBay title will say “fits all EcoDiesel” — and that title is wrong. If the listing cannot tell you which generation it fits, it does not know.
3. The oil filter changed too. The 68229402AA was superseded by the 68492616AA (same fit, updated part number), and both are for the 2014-2019 trucks only. The 2020+ trucks use 68507598AA.

The short version: if you own a 2014-2019 EcoDiesel, you want the 68235275AB fuel/water separator and the 68229402AA (or 68492616AA) oil filter — and nothing else.

What You Actually Get, and What It Costs

Here is the real price landscape for a 2014-2019 Ram 1500 EcoDiesel fuel + oil filter kit, pulled from live listings in September 2026.

A few things the table makes clear:

• The $16.49 eBay kit is a gamble, not a filter. It has no micron rating and no third-party water-separation spec, which means the two things you are actually buying a fuel/water separator for are absent. On a common-rail EcoDiesel, that is the difference between a $16 service and a four-figure pump-and-injector replacement.
• TruckTok and Doc’s Diesel land at the same price. Both sit around $40, and both publish third-party efficiency ratings (Doc’s fuel filter is 3 micron @ 96.92%; TruckTok’s kit matches the same OE 3-micron water-separation spec). The honest comparison is that you are not saving money choosing one over the other — you are choosing a matched OE-spec kit either way.
• The real savings is against Mopar. Buying the genuine 68235275AB and 68229402AA separately runs about $76, and the Mopar bundled kit is $69.79. TruckTok at $39.50 is roughly half the OEM price for the same two-filter service, in one box.

So the value story here is not “we are cheaper than the aftermarket” — it is “we match the aftermarket price while delivering OE-spec filtration, and we are about half the dealer price.”

What to Look For When Buying

The EcoDiesel filter market is full of listings that look right and are not. Here is how to filter the listings before you spend a dollar.

Confirm the Generation

This is the single most important check. The 2014-2019 trucks take the 68235275AB fuel/water separator and 68229402AA oil filter. The 2020+ trucks take 68436631AA and 68507598AA. If a listing says “fits all EcoDiesel” without splitting the years, close the tab. A wrong-generation filter is the fastest path to a wrecked fuel system.

Check for a Real Micron Rating

A genuine EcoDiesel fuel/water separator is rated around 3 microns. That number is not marketing — it is the difference between catching the particles that score a common-rail pump and letting them through. The real Mopar filter also wraps a fine pre-filter mesh around the outside of the pleated paper, with plastic ribs holding its shape — a feature many plain pleated-paper knockoffs omit. A listing that cannot tell you the micron rating is telling you it does not test its own product.

Verify the Oil Filter Part Number

The 68229402AA is the original oil filter, superseded by the 68492616AA. Both are correct for 2014-2019. A good kit lists at least one of them, and ideally both, so you know it covers the full generation.

Confirm the O-Rings Are Included

Both filters are cartridge-style and ship with fresh O-rings. A complete kit includes them. A listing that ships element-only with no O-rings forces you to reuse a worn seal — and a reused O-ring is a slow fuel or oil leak.

Weigh the Source and the Warranty

A $16 eBay element has no one to answer for a failed pump. When the part you are installing is the only barrier between your fuel tank and a common-rail system that costs more to repair than the truck is worth, the source matters more than the price.

Installation: Two Filters, Two Housings

The EcoDiesel’s two filters live in two different places, and neither is hard to reach.

Before you start, drive the truck 5–10 miles to get the oil hot so it drains fast and carries the settled crud out with it. When you get back, let it idle 3–5 minutes to cool the turbo, then pop the hood and let the oil drain back from the heads for 10–15 minutes. The EcoDiesel’s head design traps oil in the valvetrain, and if you skip this wait you only get a partial oil change. Give the engine plenty of time to fully drain — it has a lot of oil passages, and it can take close to an hour before the drip finally stops.

Step 1: Locate the Two Filters

The fuel/water separator lives at the rear of the truck, in front of the spare tire by the rear axle, sitting above the driveshaft — a black canister you reach from underneath. The oil filter is up top, under the engine cover, sitting in a cartridge housing with a hex cap.

Step 2: Drain the Fuel/Water Separator

Before you open the fuel filter housing, drain it. The housing has a drain that lets the accumulated water and diesel run out into a catch pan. If what comes out is cloudy or watery, you are looking at exactly why the separator exists.

Step 3: Replace the Fuel Filter Element

Open the fuel filter housing and lift the old element out. The filter sits above the driveshaft, so the fuel that comes out will run down it and drip on the floor unless you catch it — two clean options: shove a large zip-top bag up over the housing before you crack the seal, or wedge a funnel underneath to direct the flow into a catch pan. If the cap is tight, start it with a fuel-filter wrench (it grabs the nubs on the bottom of the canister), then loosen the rest by hand. Swap in the new 68235275AB element — the new element has notches that line up with the posts inside the housing, so align them and snap it in until the seal seats. When you change the O-ring, use a pick and curl it under the old ring rather than stabbing straight down (which can cut it), and keep the old O-ring until you have confirmed the new one does not leak. Lubricate the new O-ring with clean diesel or a couple drops of fresh oil, then hand-thread the cap back on until it is snug — the housing is plastic, so do not overtighten it.

Step 4: Replace the Oil Filter Element

Remove the engine cover, then use a 27mm socket — a six-point, not a 12-point, so you do not round off the plastic hex — to open the top-side oil filter cap (the cap is stamped with its torque spec, roughly 18 ft-lbs / 25 N·m). Pull the old cartridge straight up and off — the housing has a check valve at the bottom that releases as you lift the filter out, so the housing drains itself. Then snap the new 68229402AA (or 68492616AA) element into place — it clicks in. Before reinstalling, check that the old O-ring did not stay stuck to the housing, seat the new O-ring in its correct groove, and thread the cap back on by hand — turn it left until the threads seat, then right to tighten — until it stops, then snug it. Do not overtighten the plastic cap.

Step 5: Refill the Engine Oil

The 3.0L EcoDiesel needs a full-synthetic low-ash oil — the low-ash part matters because the EcoDiesel has a DPF and SCR system, and a high-ash oil will plug them. On viscosity, note that FCA updated the spec partway through the run: early trucks called for a 5W-30 (ACEA C3), while later trucks moved to a 5W-40 full-synthetic like Rotella T6 — the updated cap is printed “5W-40,” so check your cap and manual for your year. Oil capacity varies by year: the 2014 takes about 8 quarts, while the 2015–2019 take about 10.5 quarts — check your owner’s manual for your specific year. The drain plug is a 13mm socket (use a six-point — the Chrysler 13mm plug is easy to round off) — thread it back in by hand, then snug it, about an eighth-turn past hand-tight. Refill, then give the oil time to settle before you trust the dipstick — this engine’s oil passages are slow, so wait 15–30 minutes, then start the engine for a minute, shut it off, and check again after another 15 minutes. Top up until the dipstick sits on the MAX line.

Step 6: Prime and Verify

Turn the key to RUN without starting to let the fuel pump prime the new filter, then start it and check both the fuel housing and the oil cap for leaks. A short hesitation on first start is normal while the system purges air.

Step 7: Reset the Oil Life Monitor

After the oil change, reset the oil-life reminder so it stops nagging you. With the engine off but the ignition in RUN (turn the key or dial to ON without starting — you may need to press the start button twice), use the buttons on the left side of the steering wheel to scroll to “Oil Life.” Press and hold the right button to reset, confirm when prompted, and the readout returns to 100%.

Five Expensive Mistakes

Mistake 1: Buying a 2020+ Filter for a 2014-2019 Truck

This is the big one, and it is everywhere. The 2020+ EcoDiesel uses 68436631AA, and the 2014-2019 uses 68235275AB. A careless listing will say “fits all EcoDiesel.” A wrong-generation filter can hold just long enough to let unfiltered fuel reach the pump before it fails — and by the time you notice, the damage is done. Always confirm the generation against your year.

Mistake 2: Buying a $16 White-Label “Fuel + Oil Kit”

A $16 filter with no micron rating and no water-separation spec is not a fuel/water separator — it is a paper roll in a plastic can. The EcoDiesel’s common-rail pump does not forgive a single tank of watery fuel. The savings evaporate the moment the high-pressure pump and injectors come out.

Mistake 3: Reusing the O-Rings

Both the fuel and oil elements are cartridge-style and ship with fresh O-rings. A reused O-ring is a slow leak, and on the oil side a leak at 25 N·m of cap torque is an oil-pressure problem. Replace every O-ring, every time.

Mistake 4: Overtightening the Plastic Housings

The fuel filter housing and the oil filter cap are both plastic, and they thread onto plastic or composite housings. Overtightening the fuel cap will crack it, and overtightening the oil cap past 25 N·m (18 ft-lbs) will strip the threads. Snug is correct; gorilla-tight is a new housing.

Mistake 5: Skipping the Drain-and-Prime

Some owners swap the elements and fire the truck dry. The common-rail pump does not tolerate running dry. Always drain the separator, and always cycle the key to prime the fuel system before you start — a short hesitation on first start is normal, but running it dry is not.

Frequently Asked Questions

What fuel filter does a 2014-2019 Ram 1500 EcoDiesel take?

The 68235275AB fuel/water separator (which supersedes the original 68235275AA). It is a 3-micron cartridge that strips water from the diesel and protects the high-pressure common-rail pump.

What is the difference between the 68235275AB and the 68436631AA?

They are different generations. The 68235275AB fits the 2014-2019 EcoDiesel, and the 68436631AA fits the 2020-and-newer EcoDiesel. They are physically different and do not interchange. Installing the wrong one is a fast path to a ruined fuel system.

What oil filter does a 2014-2019 EcoDiesel take?

The 68229402AA cartridge oil filter, which was superseded by the 68492616AA (same fit, updated part number). Both are correct for the 2014-2019 trucks. The 2020+ trucks use a different filter, the 68507598AA.

Why does the EcoDiesel need a fuel/water separator instead of a plain fuel filter?

Because the 3.0L EcoDiesel runs a common-rail injection system at extremely high pressure, and the high-pressure pump is lubricated by the fuel itself. Water in the fuel strips that lubrication and destroys the pump. The separator’s job is to pull the water out before it can reach anything downstream.

How often should I change these filters?

Change the oil filter with every oil change — every 8,000 to 10,000 miles under normal conditions, or 5,000 to 7,000 miles under severe duty. The fuel/water separator is a different schedule: Ram’s book says 30,000 miles, but most owners change it much sooner — every 10,000 to 15,000 miles — because the separator catches water and dirt that would otherwise starve the engine. If the truck is new to you, do a first oil change early — around 2,000 to 2,500 miles — to flush the break-in metal, then settle into the regular schedule.

What tools do I need?

A 27mm six-point socket for the oil filter cap (a 12-point will round the plastic hex), a 13mm six-point socket for the drain plug, a torque wrench (the oil cap is stamped with its spec — roughly 25 N·m / 18 ft-lbs), a catch pan, and a basic ratchet. Nothing exotic — the fuel filter housing is hand-threaded.

Can I use a cheap $16 “fuel + oil kit” from eBay?

Not safely. Those listings are almost always a fuel element with no micron rating and no water-separation media, which means the two things you are actually buying a separator for are absent. On a common-rail EcoDiesel, that is a four-figure risk for a $23 savings.

Is Doc’s Diesel’s kit the same thing?

Functionally similar and priced almost identically. Doc’s 2014-2019 EcoDiesel kit (DGF412 + D10232) runs about $40 — within a dollar of this one — with a third-party-tested fuel filter (3 micron @ 96.92%) and oil filter (25 micron @ 99%). Both sit at roughly half the Mopar OEM price.

How does the high-pressure pump fail, exactly?

The EcoDiesel’s common-rail pump runs at very high pressure and uses fuel as a lubricant. Water or fine particulate strips that lubrication, the pump’s internal surfaces gall, and it sheds metal — which then travels through all the injectors. It is not gradual wear; it is a cascade failure that takes the pump and injectors together.

Should I change the fuel and oil filters together?

Yes. Their service intervals overlap, and buying them together costs less than two separate orders. It also means you show up to the job with everything, instead of realizing halfway through that you are missing the second filter.

Will a 2020+ EcoDiesel filter kit work on my 2014-2019?

No. The 2020+ trucks use the 68436631AA fuel filter and 68507598AA oil filter, which do not fit the 2014-2019 trucks. If a listing says one kit covers both generations, it is wrong — and installing it can wreck your fuel system.

What oil does the 3.0L EcoDiesel take?

The EcoDiesel needs a full-synthetic low-ash oil to protect the DPF and SCR system. On viscosity, FCA updated the spec partway through the run — early trucks used a 5W-30 (ACEA C3), and later trucks moved to a 5W-40 full-synthetic like Rotella T6. Check your oil cap and manual for your year. Capacity is about 8 quarts for the 2014 and about 10.5 quarts for the 2015–2019. The EcoDiesel is hard on oil because of its emissions equipment, so stick to the full-synthetic low-ash spec and do not stretch the interval.

Get the Right Filters, in One Box

If you are maintaining a 2014-2019 Ram 1500 3.0L EcoDiesel, the kit that matches this guide is the TruckTok 2014-2019 3.0L Ram 1500 EcoDiesel Fuel & Oil Filter — a 68235275AB fuel/water separator and a 68229402AA oil filter that drop directly into the factory housings.

What you get: a 3-micron fuel/water separator to protect the high-pressure pump, and a cartridge oil filter, both with fresh O-rings. It costs $39.50 — roughly half the Mopar OEM price for the same two-filter service, and right in line with the aftermarket brands that actually publish their efficiency ratings.

Want to talk to other EcoDiesel owners before you buy? Here are the threads you want:

• 2014-2019 Ram 1500 EcoDiesel Fuel Filter — Replaces 68235275AB — the fuel/water separator thread
• 2014-2019 Ram 1500 3.0L EcoDiesel Oil Filter — Replaces 68229402AA — the oil filter thread
• Are You Using the Right Fuel & Oil Filters on Your EcoDiesel? — the general fitment discussion

Legal Disclaimer

This guide is for informational and educational purposes only. Always consult your vehicle’s owner’s manual and follow the manufacturer’s specified maintenance procedures and torque specifications for your specific model year. Filter part numbers and specifications change between the 2014-2019 and 2020+ EcoDiesel generations; verify fitment against your VIN before purchasing. The pricing data in this article reflects listings observed in September 2026 and may vary. TruckTok is not affiliated with FCA, Mopar, Doc’s Diesel, Wix, or any other manufacturer referenced herein. All product names, part numbers, and trademarks are the property of their respective owners.