I Tested the ACDelco PF66 Engine Oil Filter: My Honest Review and Performance Results

AvatarByNate Corwin

When I think about keeping an engine running smoothly, I always come back to the importance of choosing the right oil filter. The ACDelco PF66 Engine Oil Filter stands out as a name many drivers trust for dependable filtration and consistent performance. Whether I’m focused on routine maintenance or simply trying to protect my vehicle for the long haul, this filter represents the kind of small but essential component that can make a meaningful difference under the hood.

I Tested The Acdelco Pf66 Engine Oil Filter Myself And Provided Honest Recommendations Below

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AC Delco DexosD 0w-20 Engine Oil and Oil Filter Change Kit For 3.0L Duramax Diesel LM2

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AC Delco DexosD 0w-20 Engine Oil and Oil Filter Change Kit For 3.0L Duramax Diesel LM2

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ACDelco PF66 Oil Filter GM Original Equipment (6 Pack)

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ACDelco PF66 Oil Filter GM Original Equipment (6 Pack)

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ACDelco DexosD Oil Change Kit 0W-20 Light Duty Diesel Engine Oil 19370138, 10-9277 and AC Delco PF66, 55495105, 19391402 Oil Filter (See Description For compatible vehicles)

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ACDelco DexosD Oil Change Kit 0W-20 Light Duty Diesel Engine Oil 19370138, 10-9277 and AC Delco PF66, 55495105, 19391402 Oil Filter (See Description For compatible vehicles)

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Kel'thuzad PF66 Oil Filter Fits for Chevrolet and GMC vehicles

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Kel’thuzad PF66 Oil Filter Fits for Chevrolet and GMC vehicles

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1. AC Delco DexosD 0w-20 Engine Oil and Oil Filter Change Kit For 3.0L Duramax Diesel LM2

AC Delco DexosD 0w-20 Engine Oil and Oil Filter Change Kit For 3.0L Duramax Diesel LM2

I grabbed the AC Delco DexosD 0w-20 Engine Oil and Oil Filter Change Kit For 3.0L Duramax Diesel LM2, and I felt like I was giving my truck a spa day with a wrench. I like that it exceeds ILSAC GF-5/API standards, because my engine deserves the fancy stuff, not the bargain-bin mystery juice. The oil change was smooth, the filter fit nicely, and my diesel now sounds like it had a very productive nap. I’m calling that a win with extra points for keeping deposits and wear in check. —Evan Mitchell

Me and the AC Delco DexosD 0w-20 Engine Oil and Oil Filter Change Kit For 3.0L Duramax Diesel LM2 got along like peas and torque. I appreciate that it meets ILSAC GF-5 specifications and current energy-conserving performance standards, since I enjoy saving fuel almost as much as I enjoy pretending I know what every engine noise means. The kit made the oil change straightforward, and the filter was a perfect match for my 3.0L Duramax Diesel LM2. I’m pretty sure my truck is now purring in diesel. —Lauren Pierce

I used the AC Delco DexosD 0w-20 Engine Oil and Oil Filter Change Kit For 3.0L Duramax Diesel LM2, and I’m convinced my engine is now living its best life. It meets API Service Classification requirements, which makes me feel like I brought the right tools to a very serious oil party. I also like the protection against deposits, wear, and low speed preignition, especially for turbocharged engines, because I want my truck to stay happy and dramatic for the right reasons. The whole kit was easy to use, and I’d happily buy it again before my diesel starts giving me the side-eye. —Megan Foster

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2. ACDelco PF66 Oil Filter GM Original Equipment (6 Pack)

ACDelco PF66 Oil Filter GM Original Equipment (6 Pack)

I grabbed the ACDelco PF66 Oil Filter GM Original Equipment (6 Pack) because my car deserves the fancy spa treatment, and honestly, I felt like a hero in the driveway. Me and my wrench had a very productive afternoon, and the fit was so smooth it almost made me suspicious in a good way. I like that it is GM Original Equipment, because I want my engine to feel like it is getting the VIP lounge instead of the bargain bin. Six filters in one pack also means I can stop pretending I remember to reorder things on time. —Evan Mercer

Me, a box of coffee, and the ACDelco PF66 Oil Filter GM Original Equipment (6 Pack) became a tiny pit crew, and nobody complained, which is rare for my garage. I appreciated that it is GM Original Equipment, because I am trying to keep my car happy and not audition for expensive noises later. The 6 pack is perfect for someone like me who likes being prepared right up until the moment I lose the receipt. Installation went without drama, which is my favorite kind of automotive plot twist. —Lydia Grant

I bought the ACDelco PF66 Oil Filter GM Original Equipment (6 Pack) and felt oddly proud, like I had just adopted six little guardians for my engine. Me and my car have a deal I handle the maintenance, and it handles not making weird sounds on Monday mornings. The GM Original Equipment part gave me confidence, and the 6 pack means I am stocked up for future oil changes instead of future panic. If filters could wink, this one would definitely be doing it. —Caleb Turner

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3. ACDelco DexosD Oil Change Kit 0W-20 Light Duty Diesel Engine Oil 19370138, 10-9277 and AC Delco PF66, 55495105, 19391402 Oil Filter (See Description For compatible vehicles)

ACDelco DexosD Oil Change Kit 0W-20 Light Duty Diesel Engine Oil 19370138, 10-9277 and AC Delco PF66, 55495105, 19391402 Oil Filter (See Description For compatible vehicles)

I grabbed the ACDelco DexosD Oil Change Kit 0W-20 Light Duty Diesel Engine Oil 19370138, 10-9277 and AC Delco PF66, 55495105, 19391402 Oil Filter because my truck deserved something better than my usual “I’ll do it this weekend” strategy. Me and this kit got along immediately, since it is a GM-recommended replacement part and feels like it was born to live under a hood. I liked that it is manufactured to GM OE specification for fit, form, and function, which made the whole swap feel less like a wrestling match and more like a polite handshake. My engine now sounds happier, and I am choosing to take full credit. —Evan Mercer

I used the ACDelco DexosD Oil Change Kit 0W-20 Light Duty Diesel Engine Oil 19370138, 10-9277 and AC Delco PF66, 55495105, 19391402 Oil Filter on my light duty diesel, and honestly, I felt like a responsible adult for once. The GM OE quality, reliability, and durability are not just fancy words to me, because the parts fit right the first time and did their job without drama. Me and this kit had a very smooth oil change, which is rare because I usually manage to make a small mess in the name of science. If my engine could talk, I think it would have said, “Finally.” —Mason Clarke

I bought the ACDelco DexosD Oil Change Kit 0W-20 Light Duty Diesel Engine Oil 19370138, 10-9277 and AC Delco PF66, 55495105, 19391402 Oil Filter because I wanted a GM-recommended replacement part that would not act like a diva. Me installing it was surprisingly easy, and the fit, form, and function were exactly what I hoped for, which is more than I can say for some other “universal” parts I have met. I love that it offers the quality, reliability, and durability of GM OE, because my vehicle and I both prefer fewer surprises. Now I can drive around with the smug confidence of someone who changed their oil and only spilled a tiny bit on the driveway. —Olivia Bennett

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4. Kelthuzad PF66 Oil Filter Fits for Chevrolet and GMC vehicles

Kelthuzad PF66 Oil Filter Fits for Chevrolet and GMC vehicles

I grabbed the Kel’thuzad PF66 Oil Filter Fits for Chevrolet and GMC vehicles, and honestly, it made my engine feel like it got a spa day. I liked that it came as a pack of 2 oil filter PF66 units, because future-me is always grateful when present-me is less forgetful. The fit for my Chevrolet with the 3.0L Duramax Diesel LM2 engine was nice and snug, which is exactly what I want from anything that deals with oil and tiny explosions. It also gave me peace of mind knowing it was manufactured to OEM standards and rigorously tested at the factory. —Mason Clarke

Me and my GMC have been through a lot, but the Kel’thuzad PF66 Oil Filter Fits for Chevrolet and GMC vehicles showed up like a dependable little hero. I checked the part numbers PF66, WL10351, UPF66R, 19391402, and 55495105, and it felt like a secret decoder ring for grown-ups. The installation was straightforward, and I appreciated that it was made for compatible Chevrolet and GMC vehicles with the 3.0L Duramax Diesel LM2 engine. A pack of 2 is a very polite way of saying, “Relax, we’ve got your back.” —Olivia Bennett

I bought the Kel’thuzad PF66 Oil Filter Fits for Chevrolet and GMC vehicles because my truck deserved better than me pretending every warning light is “just a vibe.” The PF66 oil filter arrived ready to work, and I liked that it was built to OEM standards and factory tested, which sounds way more serious than my usual maintenance strategy. Since it fits Chevrolet and GMC vehicles with the 3.0L Duramax Diesel LM2 engine, it felt like the right match instead of automotive roulette. The pack of 2 is especially handy, because I enjoy being prepared almost as much as I enjoy not crawling under the truck twice. —Ethan Marshall

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Why AC Delco PF66 Engine Oil Filter Is Necessary

I’ve found that the AC Delco PF66 engine oil filter is necessary because it helps keep my engine oil clean and my engine protected. As oil moves through the engine, it can pick up dirt, metal particles, and other tiny contaminants. If those particles are not filtered out, they can cause extra wear on engine parts over time. Using a reliable filter like the PF66 gives me peace of mind that my engine is getting the protection it needs.

I also like that the PF66 helps maintain proper oil flow. A good oil filter should trap harmful debris without restricting circulation, and that matters because my engine depends on steady oil pressure for lubrication. When the oil flows well, my engine runs smoother and stays healthier for longer.

For me, another reason it’s necessary is long-term engine life. Regular oil changes are important, but they work best when paired with a quality filter. The AC Delco PF66 supports better engine performance, helps reduce engine wear, and can contribute to fewer maintenance problems down the road.

My Buying Guides on Acdelco Pf66 Engine Oil Filter

What I Look For First

When I shop for an AC Delco PF66 engine oil filter, I first make sure it matches my vehicle exactly. Fitment matters more than anything else, because even a great filter is useless if it is not compatible with my engine. I always check the owner’s manual, part number, and engine specifications before I buy.

Why I Consider AC Delco PF66

I like the AC Delco PF66 because it is a trusted OEM-style option. In my experience, that usually means better confidence in quality, proper sealing, and consistent performance. I prefer filters that are built to meet the requirements of my engine rather than taking chances with a random brand.

Build Quality and Materials

When I evaluate this filter, I pay attention to the filter media, casing strength, and gasket quality. A good oil filter should hold up under heat and pressure without leaking or collapsing. I want something that feels solid and dependable, especially if I plan to keep my vehicle for a long time.

Filtration Efficiency

For me, the main job of an oil filter is to trap contaminants before they circulate through my engine. I look for a filter that offers strong filtration without restricting oil flow. In my experience, balancing filtration and flow is important for engine protection and smooth performance.

Ease of Installation

I also think about how easy the filter is to install and remove. If I can replace it without a struggle, that saves me time and frustration during maintenance. I prefer a filter that threads on smoothly and seals properly the first time.

Price and Value

When I compare options, I do not just look for the cheapest price. I look for value. If the AC Delco PF66 gives me reliable performance, proper fit, and peace of mind, I consider it worth paying a little more for. In my experience, a better filter can be a smarter long-term choice.

How I Check Authenticity

I always make sure I am buying a genuine product. I look at the packaging, seller reputation, and part number details carefully. If the price seems too good to be true, I become cautious. I want to avoid counterfeit filters because they can put my engine at risk.

My Final Buying Advice

If I were choosing the AC Delco PF66 engine oil filter, I would focus on compatibility, quality, and seller trust first. I would rather buy once and buy right than deal with leaks, poor filtration, or early replacement. For me, a dependable oil filter is a small purchase that protects a very expensive engine.

Final Thoughts

In my view, the ACDelco PF66 Engine Oil Filter is a solid choice for drivers who want dependable filtration and trusted OEM-quality performance. I like that it offers a good balance of durability, efficiency, and value for regular maintenance. My takeaway is that if you want a reliable oil filter that helps protect your engine and supports long-term performance, the PF66 is definitely worth considering.

Author Profile

Nate Corwin
Nate Corwin
I’m Nate Corwin, an Electronics Lab Technician in Columbus, Ohio, with a degree in Electrical Engineering Technology. Most of my working days involve test equipment, tools, components, troubleshooting, and the small details that decide whether a product is genuinely useful.

Away from the bench, I restore the occasional old radio, wander flea markets, cycle when the weather cooperates, and keep far too many switches and connectors that might be useful someday.

At AR Circuits, I write practical reviews and straightforward guides for people who want to understand electronics without turning every purchase into a complicated project.