Ford Super Duty Diesel Ownership, Warranty & Used Years

Diesel care, warranty and used buying

Does the diesel use DEF?

Yes. The 6.7L Power Stroke uses Diesel Exhaust Fluid with a level gauge in the cluster. Keep a jug in the shop; DEF can freeze in a Barron January, and the system is designed to thaw it, but don’t let it run low before a long tow.

What MPG does a diesel F-250 or F-350 get?

Heavy-duty pickups this size aren’t EPA-rated, so there is no official number. Owners commonly report mid-to-high teens unloaded on the highway and roughly 9–12 mpg pulling heavy — treat that as owner-reported, not a Ford figure. Winter-blend diesel and long idling lower it.

Does the Super Duty have an exhaust brake?

Yes, the 6.7L Power Stroke has a driver-selectable exhaust brake to hold speed on long grades. Gas trucks rely on Tow/Haul downshifting for engine braking.

What maintenance does the 6.7L diesel need?

Follow the intelligent oil-life monitor and the owner’s-manual schedule for oil, fuel filters and DEF. Fuel-filter intervals in particular depend on severe-service use, so we point you to the schedule rather than one mileage number. Full list: diesel ownership, warranty and used years.

Is the diesel worth the extra cost over gas?

If you tow heavy, often or far, usually yes: the top Super Duty tow ratings (35,000 lb fifth-wheel, 40,000 lb gooseneck per ford.com) are diesel-only, and ford.com caps the 7.3L at 22,500 lb. If you plow, haul a slide-in camper or tow under about 15,000 lb on weekends, the gas 7.3L usually wins on purchase price, payload, maintenance cost and cold starts. The diesel option price is on the sticker; we don’t guess it here. Exact equipment and price are on the window sticker of the truck you’re looking at — ask us for it.

What warranty comes on a Super Duty?

Ford’s new-vehicle coverage is 3 years/36,000 miles bumper-to-bumper and 5 years/60,000 miles powertrain, with longer coverage on certain Power Stroke diesel engine components (commonly 5 years/100,000 miles). Confirm current terms in Ford’s warranty guide. Ford Protect plans can extend coverage. Warranty details.

Best used Super Duty diesel years?

Shoppers often target 2017–2022 aluminum-body trucks, and 2023+ for the current design. Condition and records matter more than year: run the VIN for open recalls and get service history. More: used Super Duty buying and Ford Blue Advantage certified used.

Will an F-250 or F-350 fit in my garage?

Often not easily. Super Duty pickups are long (Crew Cab long-bed is roughly 20+ feet) and tall, and ford.com lists 85.3 inches wide with mirrors folded. Measure your door height and depth and compare to the exact cab/bed spec; most Crew Cab long beds want a deep or shop-style garage.

Does the Super Duty have Max Recline seats?

Ford offered Max Recline seats on upper trims in recent model years. Availability is by trim and package, so check the 2027 order guide or the sticker on the truck you’re considering.