Doc's Diesel Oil Kits

Right Oil. Right Filter. Right in One Box.

The oil change is the heartbeat of diesel ownership—the one service that comes around more than any other and does more than any other to decide how long your engine lives. It's also where two classic mistakes happen: the wrong oil, and the wrong amount of it. Diesels aren't gas engines; a 6.7L Cummins swallows 12 quarts, a 6.7L Powerstroke takes 13, and guessing at either the spec or the capacity is how expensive problems start. Doc's Diesel Oil Kits eliminate both mistakes in one box: the correct full synthetic oil, in the correct quantity, paired with the filters your engine needs—matched to your exact truck, ready to pour.

Pick Your Kit: The Oil Change, or the Whole Service.

Two ways to go, depending on the day. Our Oil Change Kits are the essentials—fresh, high-quality diesel oil and a new Doc's oil filter rated at 25 microns and 99% efficiency—perfect for the owner who stays on top of intervals and just needs this service handled. When it's time for the big one, our Oil + Filter Maintenance Kits go all in: oil plus the full filter lineup—oil filter, fuel filter, fuel/water separator, engine air filter, and cabin air filter—so one box knocks out every filter on the truck in a single afternoon. Either way, there's no hunting parts across three websites and no math on quarts at the parts counter. Grab the kit, do the job, get back on the road.

Built to OEM Specs. Backed by the Doc's Fitment Guarantee.

Every component in every kit—from the oil's additive package to the filter media and seals—is engineered to meet or exceed OEM design, fit, and function, and installing Doc's parts correctly keeps your factory warranty fully intact. Our full synthetic diesel oil is built for severe operating conditions, with the wear protection, oxidation control, and cold-start performance hard-working engines demand. And it's all covered by our Fitment Guarantee: if anything in your kit doesn't fit your truck, we'll make it right. No guesswork. No BS.

Doc's Makes Oil Change Day Easy.

Start with our Vehicle Selection Tool—enter your year, make, and model, and we'll show you the exact kit with the right oil spec and capacity for your engine, whether that's a Cummins, Powerstroke, Duramax, or EcoDiesel. Then keep the rhythm: change your oil every 5,000 to 7,500 miles maximum, and lean toward 5,000 if you tow, haul, or work the truck hard. Oil filters run every 5,000 to 7,000 miles, or 10,000 to 15,000 at the outside. On a diesel, cheap oil changes done on time beat expensive repairs done late—every single time.

Free Shipping on All U.S. Orders $99+

With diesel oil capacities, a single kit clears our free shipping line on its own—so every Oil Kit ships free anywhere in the U.S. when your order tops $99. Buy one for this service and one for the shelf, add a bottle of oil friction treatment, and you're set until next interval. Your diesel asks for one thing on schedule. Doc's puts it in a box.