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TOUGHER OIL. STRONGER ENGINE.
Reduce Engine Friction, Heat & Vibration
Helps Prevent Injector Stiction
Added Lubrication + Protection for Cold Starts
Wear Defense & Helps Engine Longevity
Runs Smoother. Lasts Longer.
Cuts engine friction and heat so your rig runs cooler and performs stronger, mile after mile.
Keeps Injectors Snappy.
Stops sticky buildup before it starts, keeping your injectors firing clean and consistent.
Cold Starts? No Problem.
Boosts oil protection when it matters most, guarding your engine from startup wear.
Max Protection. Every Mile.
Engineered with advanced non-chlorinated chemistry, Doc’s Diesel Oil Friction Treatment delivers true wear protection and smoother performance for both diesel and gas engines.
Max Protection. Every Mile.
Engineered with advanced non-chlorinated chemistry, Doc’s Diesel Oil Friction Treatment delivers true wear protection and smoother performance for both diesel and gas engines.
Customer Reviews
FREQUENTLY ASKED QUESTIONS
What’s your shipping policy?
We offer free shipping over $99 on all orders within the contiguous United States. Expedited shipping is available for an additional charge. Alaska, Hawaii, and Canada will have shipping fees.
Where does Doc’s Diesel ship to?
We ship to the U.S. and Canada! For Canada orders, any taxes, duties, or customs fees are the responsibility of the buyer. We handle orders in 1-2 business days, and most of the time in less than 24 hours if ordered on a week day. Depending on location, U.S. orders will arrive between 3-5 business days from your order. Canada orders typically arrive within 7-11 days.
What is your warranty?
View our Official Limited Warranty
Doc’s Diesel Filters meet or exceed Original Equipment Manufacturer’s (OEM) requirements. New vehicle warranties stay in effect when Doc’s Diesel filters are installed correctly and in conjunction to engine manufacturer’s recommendations.
Where is my order?
If you have not received your confirmation email us sales@docsdiesel.com so we can get everything sorted out ASAP. If you received a confirmation but no shipment email, we are still working on your order. Don't hesitate to email sales@docsdiesel.com if you would like more information and we'd be happy to check on your order. Please Include your order # in the email.
For Tracking information, it will be in your shipment email. Check the tracking # first or the latest updates. Doc's Diesel, just like you are at the mercy of shipping companies after a shipment leaves our warehouse. If there's been an issue with shipment we will happily work with you to figure out where the order is and what we can do to help. You can reach out to sales@docsdiesel and include your order # in the email. Thank You!
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 sales@docsdiesel.com.
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. Once filters are received, we will refund your money (minus price of return shipping) within 2-4 business days. We will refund to your original form of payment.
To start a return, visit our Returns Center.
View Our Official Limited Warranty Policy
Thank you!