Power Stroke Diesel Service in Moses Lake, WA

Ford's 2026 Super Duty owner's manual lists the 6.7L as a 406-cubic-inch V8 diesel that requires ultra-low sulfur diesel, with biodiesel blends up to B20 allowed. It takes 15.0 quarts of oil including the filter. Ford's first choice is its own Motorcraft SAE 10W-30 Super Duty Diesel Motor Oil; another brand works if it has the correct viscosity and meets Ford's WSS-M2C171-F1 spec.

Among the alternates the manual lists are Motorcraft SAE 5W-40 full synthetic for severe duty service or for fuel with more than 5% biodiesel, and SAE 0W-40 for places that reach 22 degrees below zero.

Own an older Power Stroke? Each generation has its own intervals and oil specs, so go by the manual for your model year, which Ford posts on its owner manuals page.

Ford's manual counts these as severe driving conditions: trips under 5 to 10 miles, temperatures well above or below average, any dusty driving, idling more than recommended, and hauling a heavy load or towing. Any one of them puts your truck on the severe-service items in the chart, including fuel filters every 15,000 miles instead of 30,000.

Around Moses Lake that list is easy to hit. Harvest season raises dust on farm roads across the Basin, summer heat and winter cold snaps both qualify, and a loaded trailer headed west on I-90 toward the Columbia River crossing at Vantage is towing by any measure. Ford adds that dusty use means inspecting and replacing the engine and cabin air filters more often, and diesel Super Duty trucks carry an air filter restriction gauge that Ford wants checked every month.

DEF is what the 6.7L's selective catalytic reduction system uses to turn nitrogen oxides into nitrogen and water. Ford's estimate is 2 to 6 percent of the fuel you burn, so a month with 100 gallons of diesel means 2 to 6 gallons of DEF, with payload, towing, driving style, altitude, humidity and temperature moving the number. Buy API-certified DEF only, and keep it out of the fuel tank. Low or contaminated DEF brings a 50 mph speed cap. An empty tank that isn't refilled leaves the engine at idle only after the next stop, and Ford says a minimum of 1 gallon is needed to clear that.

The diesel particulate filter cleans itself as you drive. Short hops and long idles keep it from finishing, so Ford's answer is a drive of 20 minutes or more now and then on the freeway or a main road, in a gear that keeps the engine between 1,500 and 3,000 rpm. Once the filter reads full, the instrument cluster lets you start a manual cleaning at idle. Plan on roughly half an hour, outdoors, with the truck 10 to 15 feet from obstructions and from anything that could catch fire or melt.

That warning matters here in late summer. Ford says never to park or idle over dry grass or leaves, because regeneration pushes exhaust temperatures very high and the exhaust stays hot after the engine is off. Stop on gravel or pavement, not in a stubble field.

On cold mornings, if your truck has a block heater, Ford says it works best below 0 F and should run no more than three hours at a time. DEF can freeze below 12 F. The truck has a DEF heater, but an overfilled tank that freezes can be damaged, so don't top it past full in a cold snap.

If your truck shares a yard with tractors and a tank of red-dyed diesel, keep the nozzles apart. Ford's manual says not to use agricultural fuel, home heating oil or any diesel not intended for highway use, notes that red dye marks fuel for agricultural and off-road use, and warns that the wrong fuel can damage the injection system, the engine, the exhaust catalyst and the particulate filter.

Ford's warranty guide also excludes damage caused by contaminated or improper fuel or fluids, so a tank of the wrong diesel can become an out-of-pocket repair.

Ford's 2026 warranty guide carves out separate Diesel Engine Coverage for the direct-injection 6.7L, good for 5 years or 100,000 miles, whichever arrives first. Its parts list runs from the block, heads and internal parts to the turbocharger, injectors, glow plugs and high-pressure fuel injection pump. It leaves out fuel lines, the fuel tank and the frame-mounted fuel conditioning module, the filter and water separator under the truck. Powertrain coverage runs 5 years or 60,000 miles, and base coverage under the New Vehicle Limited Warranty runs 3 years or 36,000 miles.

Ford makes scheduled maintenance the owner's job: skipping it can void coverage on the parts it affects, so keep every receipt with the truck. Warranty repairs are done at a Ford dealer, and we are one. Commercial customers with a Ford Fleet Identification Number may qualify for a 5-year / 100,000-mile powertrain extension on Super Duty trucks reported as fleet sales when new; the guide spells out who is eligible.

Ford Parts installed here come with Ford's 2-year, unlimited-mile limited warranty, which includes limited labor costs, and Clary Repair Protection adds a 2-year / unlimited-mile warranty on qualifying repairs. Clary Repair Protection does not cover regular maintenance or warranty work.

The service department works Monday through Friday from 7:30 AM to 5:30 PM and is closed Saturday and Sunday. Our free courtesy shuttle gives you a ride when you leave the truck and brings you back when it's ready. Service and parts financing lets you pay over time, so a repair doesn't have to wait for payday.

Our factory-trained technicians use genuine Ford and Motorcraft parts. While the truck is here, ask about its tires at our tire shop, or see what else is on service specials. Gas trucks and cars in the family go through our oil change service.