2007-2016 Duramax 4-Filter Kit Guide (TP3018 / PF2232)

The Cabin Filter I Didn’t Know Existed for Six Years

I bought a used 2010 LMM Duramax a few years back and did everything right by the book — oil every 7,500 miles, fuel filter every 15,000, air filter once I noticed the turbo sounded different. Then one winter morning the cab started smelling faintly of diesel exhaust and wet dog, and the defrost took forever to clear the windshield.

The cause was a cabin air filter that had been in that truck since the day it rolled off the line. It was black, packed with dust and pollen, and half-collapsed. Nobody had ever mentioned to me that a 6.6L Duramax even had a cabin filter — and I’m far from the only owner who’s made that mistake.

That’s the quiet truth about these trucks: the powertrain filters get the attention, and the cabin filter gets ignored until you can smell the consequence. A four-filter kit closes that gap in one order.

Four Filters, Four Jobs — and Two People Forget

The 2007-2016 Duramax spans three engine generations — LBZ (2006-2007), LMM (2007.5-2010), and LML (2011-2016) — but they share most of the same maintenance hardware. A full service means four filters, and they do four very different jobs.

TP3018 Fuel Filter. The spin-on fuel/water separator that protects the high-pressure pump. On the 2001-2016 trucks, the TP3018 is the official ACDelco spin-on fuel/water separator that threads onto the passenger-side firewall, and it’s the only thing standing between your high-pressure pump and whatever sediment and moisture has been collecting in the fuel tank. It catches particles down to 4 microns and strips 99%+ of water. The 2007–2010 LMM runs the durable CP3, while the 2011–2016 LML switched to the far less forgiving CP4.2 — feed either one water long enough and it eats itself from the inside.

PF2232 oil filter. The spin-on canister that’s been specced for Duramax engines since 2001. It runs about 5.5 inches long with a silicone anti-drainback valve rated for 15 psi backpressure, and it holds the oil in the filter gallery overnight so you don’t get a dry-start rattle on a cold morning. On an engine whose EGR system deliberately feeds soot into the crankcase, the oil filter is the last line of defense against abrasive carbon doing laps through the bearings.

Engine Air Filter — D3087C or A3141C. Match the filter to your engine generation: 2006–2010 LBZ/LMM trucks use the D3087C, while 2011–2016 LML trucks switch to the A3141C. They are not interchangeable — the airbox dimensions changed. The LML’s variable-geometry turbo moves up to 800 cubic feet per minute under load, and a restrictive air filter makes the VGT vanes close down to compensate, which raises exhaust backpressure, raises EGT, and can trigger a DPF regen cycle. A dirty $30 air filter cascades into a $300 dealer forced regen.

The cabin air filter. The one most owners don’t know exists. It’s a carbon-impregnated element that filters the air coming into the cab, and it’s the reason your defrost works and your truck doesn’t smell like the highway. It also splits by body style — 2007-2014 trucks take one shape, 2015-2019 trucks take another — so it’s easy to grab the wrong one at the parts counter.

What You Actually Pay: The Real Comparison

We pulled prices across every major channel in September 2026 to see where a four-filter service actually lands. The thing to watch is what the “fourth filter” is — that’s where the real differences hide.

Here’s the detail that matters, and it’s easy to miss: Doc’s “Combo” kits and most eBay/Amazon “3-filter” bundles use a transmission filter as their extra piece, not a cabin filter. That’s fine if you’re also due for a transmission service, but it does nothing for the air you breathe in the cab. The TruckTok kit’s fourth slot is the cabin filter — the one that actually gets forgotten.

Prices verified September 2026. ACDelco OEM single-filter pricing: TP3012 fuel $41.99-49.87 (Amazon’s Choice, 900+ ratings), PF2232 oil $9.58-10.49, air filter $30-68 depending on year, cabin filter $15-20. Doc’s fuel filter alone runs $29.99, oil filter $13.92.

What to Look For When Buying

Match the air filter to the year. This is the single most common fitment mistake on this platform. 2006–2010 (LBZ/LMM) requires A3086C; 2011–2016 (LML) requires A3100C. If a listing says “fits 2001-2016” for the air filter, walk away — no single air filter spans that range.

Match the cabin filter to the body style. 2007-2014 is one shape, 2015-2019 is another. A cabin filter that “fits all Duramax” is a red flag, not a feature. If you want it to actually neutralize odor, step up to a carbon-impregnated element — cabin filters run from about $5 to $100, and the charcoal versions are the ones that scrub diesel smell instead of just catching dust.

Genuine ACDelco TP3012 filters are rated at 4 microns with a water-separating layer. The $18-22 white-label fuel filters on Amazon and eBay often don’t publish a micron rating at all — and on a CP3 pump that’s the difference between a filter that protects and a filter that’s just a can.

Buy the O-rings with it. The fuel filter ships with new O-rings, and they matter. A reused or missing O-ring is the #1 cause of a post-service fuel leak on these trucks.

Installation: The Order That Saves You a Headache

None of these four filters is hard on its own — the trick is doing them in an order that doesn’t fight itself, and knowing the year-specific quirks up front.

Fuel filter first ( TP3018)

The TP3018 is a spin-on canister that lives up top near the passenger-side firewall across the whole 2001-2016 run, and the standard access route is to drop the front passenger-side inner fender liner — seven 7mm screws plus some pop rivets on the older trucks, Torx T15 star bolts on the newer felt liners — and reach it through the wheel well. Watch for the wiring-harness clips mounted to the back of the liner when you lower it. Disconnect the water-in-fuel sensor connector first, then spin the canister off with an oil-filter wrench — it’s on the bottom and the space is tight enough that you work it a few degrees at a time. The water-in-fuel sensor threads into the bottom of the old canister, so unscrew it — a pair of large pliers or vise grips works if you’re careful, or there’s a dedicated tool — and move it over to the new filter rather than buying a new one, giving it a shot of electronics cleaner if it’s grimy. The kit ships with two gaskets: the big one seats on the side that threads up under the truck, the small one goes on the sensor. Lube both with diesel, and make sure the old rubber grommet came off with the old filter — a stuck grommet stacked under the new one is a double-seal leak waiting to happen. Thread the canister back on by hand and don’t overtighten it. Skip pre-filling the new filter with diesel to avoid introducing unfiltered debris into the high-pressure pump. Because factory Duramax trucks do NOT have an in-tank electric pump, you must hand-prime the system: loosen the 13mm plastic air bleeder screw on top of the filter head, and pump the primer bulb repeatedly until solid fuel flows out without air bubbles. Snug the bleeder screw back down and continue pumping until the button becomes rock-hard before cranking.

Oil filter second (PF2232)

The spin-on PF2232 sits at the bottom of the engine, driver’s side — easiest to reach from behind the driver’s front tire. These trucks take 10 quarts of 15W-40 diesel oil (Rotella T5, Mobil Delvac, or AMSOIL); below 0°F, switch to a 5W-40 like Rotella T6. The drain plug is a 13mm hex bolt (a 13mm socket on a ratchet) and it seals with a crush washer or rubber O-ring depending on the year — replace it and make sure it’s seated before you snug the plug back. Pre-fill the new filter about half to three-quarters full, lube the gasket, and spin it on hand-tight plus three-quarters of a turn — don’t use the filter wrench to tighten, the O-ring seals on its own and over-tightening is what causes the bottom leak. To keep the frame clean while the filter comes off, tuck a folded piece of aluminum foil just past the filter to channel the oil down into the catch pan. Check the old filter came off with its O-ring; a stuck O-ring double-seals and leaks. While the oil is draining, look for metal shavings on the drain plug and check whether the old oil looks thinned-out — thinning usually means fuel is getting past the injectors into the crankcase, which is worth chasing down. One thing that trips people up: right next to the oil filter there’s a red filter, and that’s the transmission filter, not the engine oil filter — don’t grab the wrong one. When you’re done, reset the oil life monitor — on the 2007-2010 LMM you key to RUN with the engine off and floor the accelerator three times; on the 2011-2016 LML you scroll the steering-wheel menu to Oil Life, press the right arrow, then the check button, and confirm.

Air filter third (D3087C or A3141C)

Pop the airbox lid — no bolts on the LML, it slides straight out once the accordion intake tube is pushed back. Note the airflow-direction arrow on the old filter before you pull it: air flows from the fender side toward the engine. Insert the new D3087C (2006–2010) or A3141C (2011–2016) filter back the same way. While the lid is off, it’s worth pulling the mass airflow sensor out of the intake duct and giving it a shot of MAF cleaner — a dirty MAF reads wrong and the truck loses throttle response and fuel economy, and it’s a two-minute job you’re already positioned for.

Cabin filter last

The cabin filter is the one that gets skipped, and on the 2007-2014 trucks it’s also the one that may not even exist yet. If your truck left the factory without a cabin filter opening — common on the early 2007-2014 models — you’ll need to retrofit a tray first: drop the panel under the glovebox (a 7mm socket on the screws), find the cover location stamped into the HVAC box, and cut the opening with a utility knife before the filter and cover can drop in. On the Chevrolet the glovebox itself can stay closed — only the lower panel has to come off. Trucks that already have the opening (2015-2019, or anything already retrofitted) are a straight slide-out-and-replace: it lives under the passenger side, you take the cover screw out with a 5.5mm socket on a 1/4" drive (a 7mm is too big and slips), slide the cover down, and pull the old filter out. The new filter folds into position — it sounds like it’s cracking, but that’s just how the pleated element bends around the opening, and a good filter (NAPA, Wix) has pre-scored fold lines for exactly this while cheap ones don’t, so you end up nearly destroying them to get them in. Then the cover goes back in slot-first and the screw gets snugged down by hand. One last thing: the first time you switch the blower on, look away from the vents — loose debris often blows through and you don’t want it in your eyes. Match the filter to your body style, and you’re done in about ten minutes.

Five Expensive Mistakes

Buying the wrong air filter

The D3087C and A3141C look close enough at a glance to fool a parts counter, but the airbox won’t close properly on the wrong one. You’ll fight the lid, the seal will pinch, and unmetered dust will get past the filter into the compressor wheel. Match the year, not the “looks about right.”

Forgetting the cabin filter entirely

The cabin filter has no warning light and no service interval anyone actually remembers. By the time you smell diesel exhaust in the cab or the defrost stops clearing, it’s been dead for years. It’s cheap, it’s easy, and it’s the one filter a four-filter kit finally forces you to address.

Running a white-label fuel filter on a high-pressure pump

The $18 Amazon fuel filter saves you $25 today and bets your injection pump on it. The CP3 is forgiving and the CP4.2 is not, but neither is free — a pump replacement runs well into four figures with labor. The micron rating on a no-name filter is often a number the seller made up, and the water-separation layer is frequently the first thing to go.

Skipping the Hand-Prime Procedure

Trying to start the truck without loosening the 13mm bleeder screw and hand-pumping the primer bulb forces the high-pressure pump to run dry, causing severe internal scuffing and long cranks.

Ignoring the O-ring

The fuel filter’s O-ring seals the housing to the pump. If the old one stays stuck on the mounting surface and you stack the new one on top, it double-seals and leaks. Check the old filter came off with its O-ring before you thread the new one on.

Frequently Asked Questions

Does the TP3018 and PF2232 fit all 2001–2016 Duramax engines?

Yes. The TP3018 fuel filter and PF2232 oil filter share a universal high-pressure mounting thread across the LB7, LLY, LBZ, LMM, and LML generations. That’s the easy part. The air and cabin filters are the ones that split by year and body style.

Which air filter do I need for my year?

2006–2010 (LBZ and LMM) trucks use the D3087C panel. 2011–2016 (LML) trucks use the A3141C. They are not interchangeable — the airbox dimensions changed with the LML.

Which cabin filter do I need?

It splits by body style, not engine. 2007-2014 trucks take one shape, 2015-2019 trucks take another. If you’re not sure, pull the old one and match it, or check by VIN.

What’s the difference between this kit and a Doc’s Diesel “Combo” kit?

The fourth filter. Doc’s Combo kits pair fuel, oil, and air with a transmission filter. This kit’s fourth slot is the cabin filter. Both are legitimate, but they solve different problems — transmission service versus cab air quality.

Why is this kit more than an Amazon white-label 3-filter bundle?

Because the white-label bundle has three filters (fuel, oil, transmission) and drops the air and cabin entirely. Add a proper air filter and cabin filter to that $39.99 bundle and you’re back up past $100 — except now you’ve bought from three sellers and none of them published a micron rating.

What does the TP3018 fuel filter actually catch?

Particles down to 4 microns, plus 99%+ of free water through its separation layer. That water separation is the whole point — a high-pressure pump that gets fed water will eventually fail, and the filter is the only barrier between the tank and the pump.

How do I prime the fuel system after replacing the fuel filter?

Loosen the 13mm air bleeder screw on top of the filter housing, hand-pump the primer bulb until air stops bubbling out and steady fuel appears, snug the screw, and keep pumping until the button goes rock-hard.

How often should I change each filter?

Fuel filter every 15,000 miles (10,000-15,000 under severe duty), oil filter at every oil change (5,000-7,500 miles), air filter every 15,000-20,000 miles, and cabin filter every 12,000-15,000 miles or annually. High-mileage trucks running conventional diesel oil should target a 5,000-mile oil and filter interval.

Is the high-pressure pump the weak point on these trucks?

Depends on the year. The 2007–2010 LMM runs the famously durable CP3, but the 2011–2016 LML switched to the CP4.2 — far less forgiving, and one reason the earlier trucks are so sought after. Either way the fuel filter is the only barrier, and water and sediment will destroy a CP4.2 much faster than a CP3.

Why buy all four at once instead of as needed?

Because the air and cabin filters are the ones you’ll never get around to on their own. Bundling them with the fuel and oil filters you have to change anyway is the only reliable way to actually replace them. You also save on the multiple shipping costs of buying separately.

Get All Four Filters, in One Box

If your 2007-2016 Duramax has been running on “whatever was on sale” filters, or the cabin filter is still the one it left the factory with, this kit closes the gap. One order puts the TP3018 fuel filter, PF2232 oil filter, the correct air filter for your year, and the cabin filter in a single box — matched to the truck and ready for one afternoon in the garage.

Get the 2007-2016 Duramax 4-Filter Maintenance Kit

Want to confirm fitment against what other owners are running? A few threads worth reading:

• 2001-2016 6.6L Duramax Fuel Filter — Replaces TP3018
• 2001-2019 6.6L Duramax Oil Filter — Replaces PF2232
• 2006-2010 6.6L Duramax Air Filter — Replaces D3087C
• 2007-2014 Silverado/Sierra Cabin Air Filter — Replaces 23101674 / CF193C

Legal Disclaimer

This guide is for general informational purposes only and is not a substitute for your vehicle’s factory service manual or the advice of a qualified diesel technician. Always verify the correct part numbers for your specific model year, VIN, and configuration before purchasing or installing filters. Installation of any aftermarket or replacement part is performed at your own risk; the author and retailer assume no liability for damage, injury, or loss arising from the use of this information or the products referenced. Filter change intervals are manufacturer recommendations and should be adjusted for your driving conditions, towing load, and fuel quality.