What is your warranty?

View our Official Limited Warranty Doc’s Diesel Filters meet or exceed (OEM) Original Equipment Manufacturer’s requirements. New vehicle warranties stay in effect when Doc’s Diesel filters are installed correctly and in conjunction to engine manufacturer’s recommendations.

Where are you located?

Bryan, Ohio

Where are your filters made?

Doc’s Diesel has many prominent suppliers with over 40 years in the industry. Doc's Diesel Products are made in Taiwan, China, and USA. Doc’s Diesel Fuel Filters are made in Taiwan. Doc’s Air, Oil, and Cabin Air filters are made in China. Doc's Diesel Treatment is made in the USA. Not all filters are made the same, Doc’s uses a unique 3 layer media to ensure peak efficiency.

Why didn’t I get a confirmation email?

Sometimes an email may get sent to your spam folder! So don’t forget to check that. If you need more help to hesitate to reach us at

How do I start a return?

If you are unhappy with your purchase for whatever reason and it's within 30 days from your purchase you can return your diesel filters back to us. Item has to be in new condition. Email us and we will email you a return slip. Once filters are received, we will refund your money within 2-4 business days. We will refund to your original form of payment minus the return slip fees.

To start a return email