Doc’s Diesel has a partner brand, Doc’s Filters, built for non-diesel rides. We offer high-quality replacement filters for gas cars, trucks, SUVs, and more through that website. From cabin air to performance engine, oil, fuel, and engine air filters, we’ve got you covered.

Bryan, Ohio.

We offer free shipping over $99 on all orders within the contiguous United States. Expedited shipping is available for an additional charge. Alaska, Hawaii, Canada, and Puerto Rico will have shipping fees.

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.

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.

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!

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.

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!

We can help you with that. Just email sales@docsdiesel.com within 2 hours of placing it. Be sure to include your Doc’s order number (starts with DD) so we can find it fast.

Heads up: Orders placed after 12 PM EST on Fridays get processed Monday morning. If you order late Friday or over the weekend and need to cancel, shoot us a message—we’ll handle it first thing Monday.

We honor those who protect and serve. Doc’s Diesel is proud to offer 11% off for current and former U.S. Military personnel and first responders (including fire, law enforcement, and EMS). Read full details on how to access our Military Discount here.

Yes, you can do so here.We review every submission. If enough customers request the same product or category, it moves up our sourcing list. You'll be emailed if and when we add it. It takes less than 2 minutes, no account necessary, and you can submit as many requests as you would like.

When your cart hits $100 or more, you unlock three exclusive Mystery Deals — a little reward for stocking up. Three surprise items will appear at 50% off, and you can add all three to your order.Each mystery item is a real product from our catalog at half price — you won't know exactly what you're getting, but you'll always be getting a solid deal. Here's how it works:

1. Add $100+ worth of items to your cart.
2. Three Mystery Deal options appear at 50% off.
3. Select each item you want and add it to your cart — you can grab all three.
4. If a mystery item is apparel, you'll be prompted to select your size before adding it to your cart.
5. The 50% discount is applied automatically at checkout.
6. All mystery items are final sale (no returns or exchanges).

"Mystery" means you don't see it until it arrives, not that it's random. Each Mystery Item is a fixed product, so if you buy the same one again later, you'll get the same item. We plan to rotate these in the future.

Package protection is optional, but you’ve got to add it at checkout — it’s not turned on by default. Once your order is placed, it can’t be added or removed.

We ship fast, so if your package is already processed, the selection is locked in. If you choose not to purchase package protection, Doc’s Diesel isn’t responsible for lost or damaged packages during transit.

For as little as 1% of your order total, package protection covers your shipment against damage or loss caused by the carrier (FedEx, USPS, UPS).

Approximately $1 per $100, examples below:

Cost breakdown:

• $1.95 for orders up to $200
• $2.95 for orders $201-$300
• $3.95 for orders $301-$400
• $4.95 for orders $401-$500
• $5.95 for orders $501-$600
• $6.95 for orders $601-$700$
• 7.95 for orders $701-$800$
• 8.95 for orders $801-$900
• $9.95 for orders $901-$1,000

Yes, you can do so here.We review every submission. If enough customers request the same product or category, it moves up our sourcing list. You'll be emailed if and when we add it. It takes less than 2 minutes, no account necessary, and you can submit as many requests as you would like.

If your order goes missing or arrives damaged, we’ll refund or replace it. Just call or email with us to start a claim:

Phone: (419) 551-6138
Email: sales@docsdiesel.com

Have your order number ready (starts with DD) so we can pull up your info and get things moving. Refunds are issued straight to the original payment method.

Heads up: No matter what shipping you choose, we recommend adding package protection. Our Free Shipping on Orders Over $99 doesn’t include it.

Package protection does not cover theft. If tracking shows your package was delivered, it is the customer’s responsibility to file claims with FedEx, USPS, UPS, or local law enforcement.

It also does not cover shipping delays. We can only refund or replace if the carrier officially declares the package lost. This usually happens after 15 days of no movement, but it can vary by carrier.

We are not responsible for orders shipped to an incorrect address entered at checkout. If a package is returned to us, we can resend it at the buyer’s expense.