Tools

Doc's Diesel Tools

Because the Job Is Only as Good as What's in Your Hand.

Anyone who's serviced a diesel knows the truth: the parts are the easy half. It's the stuck filter housing, the oil running down your forearm, and the wrench that doesn't quite reach that turn a 30-minute job into a Saturday. Doc's Diesel Tools exist to fix that half. These are job-specific tools built for the maintenance you're already doing with our filters and kits—designed to get into the tight spots, grip what's stuck, and keep the mess in the filter instead of on your driveway. Because doing it yourself shouldn't mean doing it the hard way.

Tools That Earn Their Spot in the Box.

Our Adjustable Oil Filter Wrench is the reach-anything workhorse: 12 inches of extended reach with a 20-degree jaw bend to get deep into the engine bay, a two-position adjustable fit that spans filters from 2" to 4-5/8", and serrated jaws that lock onto fuel filter housings, exhaust clamps, and oversized sensors without slipping—even greasy and hot. Heat-treated steel means it won't flex under real torque. Then there's the Cummins Oil Filter Plug Tool, the mess-killer for RAM 6.7L Cummins owners (1989-2024): it threads into the top of the oil filter and seals it, so the filter comes out with the oil still inside instead of down your arm and across the crossmember. Solid aluminum, direct interchange with Cummins #3678921, and once you've used it, you won't change oil without it.

Built Like Our Parts. Backed the Same Way.

A tool that bends, slips, or rounds off is worse than no tool at all—so Doc's tools are built to the same standard as everything else we sell: quality materials, real-world testing, and designs that solve the actual problems diesel owners hit under the truck. Engine-specific tools like the Cummins plug list their exact fitment right on the page, and everything is covered by the same Doc's promise as our filters and kits—if it's not right, we'll make it right. No guesswork. No BS.

The Smartest Add-On in Your Cart.

Here's the move: when you order your filter kit or oil change kit, add the tool that makes the job easier while you're at it. The wrench and plug tool are one-time buys that pay for themselves in saved time and skipped cleanup on every service after—and they're the perfect way to push an order past the $99 free shipping line. Buy it once, use it every interval, wonder how you managed without it.

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

Doc's built its name helping diesel owners do their own maintenance—and the right tools are part of that promise. Stock your box with the tools that match the work, bundle them with your next service order, and everything over $99 ships free anywhere in the U.S. Good parts do the job. Good tools make it easy. Doc's brings both.