How Greg Kimpel Keeps His Diesel Trucks Hauling Mile After Mile

Doc's Diesel sat down with Greg for the latest episode of Behind the Wheel, and what he had to say is the kind of honest, road-tested perspective you can't get from a spec sheet.

Greg isn't a one-truck guy. His fleet spans a newer Ford F-250/F-350 Super Duty 6.7L Powerstroke for day-to-day hauling, alongside older platforms that need consistent maintenance to stay on the road. With a job that requires towing heavy loads long distances, powertrain health isn't optional; it's the whole ballgame.

That means engine oil, fuel filters, air filters, and all the maintenance components that keep a diesel alive under load have to be sourced from somewhere reliable, priced fairly, and available fast when you need them. For Greg, that somewhere turned out to be Doc's Diesel.

"I use my truck to pull 6k–12k lbs on a weekly basis putting in about 7,000 miles a month. I have been using Doc's fuel, oil, and air filters for a couple years now and have not had an issue. For as much as I need to do maintenance, Doc's is the best deal." — Greg Kimpel

That's not a marketing line. That's a guy who needs his trucks to start every morning, run all day, and not leave him stranded on a highway with another truck on the trailer behind him.

At 7,000 miles a month, Greg is doing more oil changes in a year than most truck owners do in three. Doc's Oil + Filter Maintenance Kits bundle everything he needs: the right oil, the right filters, and the hardware to go with them, built specifically for Powerstroke platforms. 

No hunting for separate parts. No guessing on fitment. Just everything in one box so he can get back under the truck and back on the road.

Not sure how often you should be changing oil under your use conditions? Check out our breakdown: How Often Should I Change My Diesel Engine Oil?

When you're burning diesel at Greg's rate, fuel quality matters every single day. Doc's fuel filters pull out rust, debris, and water before it ever reaches the injectors, and injector repairs on a 6.7L Powerstroke aren't cheap. High media surface area, OEM-spec construction, and maximum filtration capacity make these a no-brainer for anyone running hard miles.

High-pressure injectors on a 6.7L Powerstroke are precision components, and contaminated fuel is one of the fastest ways to shorten their lifespan. Doc's fuel filters are built with maximum media surface area and come with all the hardware you need, so there's nothing missing when it's time to swap them out.

Browse Powerstroke fuel filters and filter sets.

Towing heavy loads means the engine is pulling more air, running hotter, and working harder to maintain power under load. A clean, properly sealed air filter is part of keeping that combustion cycle efficient. 

We recently redesigned our 6.7L Cummins air filter to remove glue-strip construction entirely, switching to a stronger, self-supporting media that holds its shape under load and maximizes airflow, the kind of engineering detail that matters when your engine is working hard mile after mile. Whether you're on a Powerstroke, Cummins, or Duramax, the same philosophy applies: the right air filter keeps combustion clean and power consistent.

Doc's engine air filters are built to meet or exceed OEM specs, so there's no compromise on fitment or filtration quality.

Running hard miles? Whether you're hauling trailers, working your truck every day, or just putting serious mileage on your diesel, Doc's has the maintenance kits, filters, and additives to keep it running strong.

Curious about warranty coverage when using aftermarket parts? The Magnuson-Moss Warranty Act protects you, and Doc's is fully compliant.