#1PARTS THAT FIT. PERIOD.
Pick your year, make, model, and engine â we only show you parts that bolt straight into your truck. No adapter kits, no "close enough," no parts-counter guesswork. Built for diesel platforms (Cummins, Powerstroke, Duramax, EcoDiesel) and now for popular gas trucks too. "Fits perfectly" is the #1 phrase in our review feed, repeated thousands of times â it's what your truck should be saying about its filter, too.
#2OEM-QUALITY WITHOUT THE OEM PRICE TAG
Same factory specs. Same straight build. A fraction of the OEM price â because we cut out the dealer counter, not the engineering. Customers tell us the same thing every week: "Can't tell a difference between Doc's and OEM" â except in what they paid.
#3TRUSTED FOR 100,000+ MILES â BY THE PEOPLE UNDER THE HOOD
Truck owners run Doc's filters for 100K, 200K, even 450K+ miles and come back for the next round â and most of them tell us why in writing. The reviews on this site aren't from marketers; they're from drivers, mechanics, hotshot truckers, and fleet operators running your exact platform. "Been using Doc's for 250,000 miles. Zero issues." â exactly the proof you wanted before clicking buy.
DON'T TAKE OUR WORD FOR IT.
These are real customers. Real trucks. Real miles.
#4ISO 9001 BUILT. SAE J1985 + ISO 5011 LAB-TESTED. PUBLISHED.
Every Doc's filter is built in ISO 9001-certified facilities and run through SAE J1985 and ISO 5011 protocols by an independent lab â not in-house. Our oil filters hit 99% efficiency at 25 micron with high-flow synthetic-blend media. Geography doesn't determine filter quality; certification, testing, and engineering do â and the full test data lives on our site, not in a brochure.
#5DIESEL-TRUSTED. NOW FOR GAS ENGINES TOO.
Cummins, Powerstroke, Duramax, EcoDiesel â and now F-150, Silverado, Sierra, Ram 1500, Tundra and more. The same straight build the diesel community already trusts, engineered to factory spec for your gas truck or daily driver. Won't void your warranty.
#6IN STOCK. SHIPPED FREE. DRIVE TODAY.
Fast, free contiguous U.S. shipping on orders $99+ and parts in our warehouse â not on backorder at a dealer counter. Order today, get back under the truck this weekend. Less digging. More driving.
#7NO B.S. FITMENT GUARANTEE
If a Doc's part doesn't fit your truck, we replace it or refund you. And per the Magnuson-Moss Warranty Act, using aftermarket filters that meet OEM spec doesn't void your factory warranty â full stop. Install to spec, drive easy.
#8ONE STOP. WHOLE TRUCK. EVERY SERVICE INTERVAL.
Filters, oil, brakes, additives, hubs, complete maintenance kits â sized for your platform, ready to ship. Subscribe & Save 5% and we'll get the next round of maintenance to your driveway before the dash light comes on. Maintenance Made Easy.
Become a Diesel Diehard, and get paid to maintain your truck. It's free to sign up, and earn points on every order you place. Redeem them for cash off your next round of filters, fluids, and kits.
Members also get early access to new parts, exclusive promo windows, and a birthday perk for you (and your truck). Maintenance Made Easy â and now partially paid for, by us.
- Earn points on every order â diesel and gas parts included.
- Redeem for cash off filters, fluids, kits, and maintenance bundles.
- Members-only deals, early access to new parts, birthday rewards.
ENTER YOUR VEHICLE. WE'LL DO THE REST.