Frequently asked questions.

Shipping

Yes, we ship all over the world. Shipping costs will apply, and will be added at checkout. We run discounts and promotions all year, so stay tuned for exclusive deals.

It depends on where you are. Orders processed here will take 5-7 business days to arrive. Overseas deliveries can take anywhere from 7-16 days. Delivery details will be provided in your confirmation email.

We use UPS and USPS. You’ll be asked to select a delivery method during checkout.

NO, we do not ship on other shipping accounts dues to issues in the past.

Yes, we offer free shipping to the lower 48 US states on order over $250.00.  International orders pay all shipping charges and are responsible for any/all duties/taxes upon delivery.

Orders placed before our daily order cutoff (Monday through Friday) are processed and shipped the same business day. Once your label is generated, an automated email containing your UPS or USPS tracking link will be sent to your inbox.

Product

We source directly from factory-authorized distributors for Motorcraft, Mopar, AC Delco, MANN-FILTER, Parker Racor, and Fleetguard. Genuine OEM diesel filters feature sharp laser-etched serial numbers, strict manufacturing tolerances, correct rubber gasket seals, and distinct box labeling. Counterfeit filters often display faded branding, glue smears, loose end caps, or inferior media that can contaminate high-pressure fuel systems.

View our blog post about counterfeit filters.

/blogs/news/how-to-spot-counterfeit-filters

We always aim for make sure our customers love our products, but if you do need to return an order, we’re happy to help. Just email us directly and we’ll take you through the process.

Unopened, uninstalled items in original factory packaging can be returned within 30 days of delivery. To start a return, visit your account dashboard or contact support with your order number. Returned items must be free of grease, oil, and box damage.

Use our year/make/model filter selector or verify your vehicle’s engine size (e.g., 6.7L Powerstroke, 6.6L Duramax, 6.7L Cummins). If you have a custom chassis or cab-and-chassis application, match your exact VIN or OEM part number against the specifications listed on the product page.

Yes. We offer bulk quantity pricing on select case quantities for high-turnover filters (such as oil filter multi-packs and complete fuel/oil filter service kits). View individual product pages to see tier-discount pricing or contact our sales department for large fleet orders.

Yes. Modern 6.7L Powerstroke (Ford) and 6.7L Cummins (Ram) engines utilize a dual-stage filtration system consisting of an under-body fuel/water separator filter and an under-hood secondary engine filter. Replacing both simultaneously prevents old particles from contaminating the clean filter and ensures maximum protection for your fuel injection pump.

All cartridge-style oil filters and fuel filter kits from Motorcraft, Mopar, and AC Delco include factory-spec Viton or nitrile rubber O-rings and sealing gaskets. Always replace old O-rings and coat new ones with fresh engine oil or clean diesel fuel prior to installation.

Yes. If you are replacing a MANN-FILTER, Fleetguard, or Baldwin part number with an original Motorcraft, Mopar, or AC Delco unit, match the part number in our store search bar. You can also check the product specifications table on the item page for verified factory interchange part numbers.

While factory owner manuals recommend intervals around 15,000 to 22,500 miles under normal conditions, severe-duty driving (heavy towing, idling, or off-road use) calls for changing both primary and secondary fuel filters every 10,000 to 15,000 miles or every 3rd oil change.

Customer support

866-574-1119

Send a message

orders@dieselfiltersonline.com