Power Stroke Diesel Service in Longview, WA

Ford counts towing or hauling a heavy load, dusty roads, extended idling, trips shorter than 5 to 10 miles, and temperatures well above or below average as severe driving. A Super Duty around here can tick most of those in one week: a fifth-wheel up SR 504 toward Mount St. Helens, gravel roads into the hills, a crew truck idling on a Kelso job site, then a string of short hops across Longview.

If that sounds like your truck, follow the severe column. That means both fuel filters every 15,000 miles and more attention to the engine air filter. Ford says dusty driving calls for checking and replacing it more often, and the diesel's air filter restriction gauge, which Ford asks you to check monthly, shows when it is loading up.

The diesel particulate filter traps soot and cleans itself three ways: passively during normal driving, actively when the truck raises exhaust temperature, and manually when you start a cleaning from the instrument cluster while parked. Short trips are the enemy. Ford says drives under 15 minutes, speeds under 25 mph or a lot of stationary running may keep the filter from cleaning.

When an Exhaust Filter Overloaded or Exhaust Filter at Limit message appears, Ford's instruction is to drive above 30 mph, when it's safe, until the message turns off. For trucks that live on short trips, Ford suggests a 20-minute-plus run now and then on a highway or main road, holding the engine between 1,500 and 3,000 rpm. A round trip on I-5 to Castle Rock covers it.

Before a manual cleaning, set the parking brake outdoors, keep 10 to 15 feet of clearance from anything flammable or meltable, and carry at least 1/8 tank of fuel. Expect it to take about 30 minutes. In a dry August, keep the truck off dry grass and leaves during and right after any cleaning, because the exhaust stays very hot.

• Exhaust Filter Over Limit Service Now, which means the truck can no longer clean the filter itself
• The wrench light, which Ford uses to flag oxidation catalyst or particulate filter problems
• A low fuel pressure message
• A water in fuel warning that keeps coming back after you drain the separator
• A DEF warning, a speed limit message or a check engine light

Use only DEF certified by the American Petroleum Institute, and never pour it into the diesel filler. If DEF ever goes into the diesel tank, Ford says not to start the engine; the tank has to be drained and cleaned first. Run DEF low or contaminated and the truck's speed gets capped at 50 mph. Let the tank go empty and, after the next stop, the engine will only idle until you add DEF; Ford says one gallon is the minimum to clear that, and the speed limit stays until the tank is full.

The fuel conditioner module on the frame pulls water out of the diesel. Drain it with the engine off when the truck asks. Ford's procedure lets about half a gallon run into a container, and that fuel should not go back in the tank.

Longview rarely gets cold enough to matter, but a January trip over Snoqualmie Pass or into Eastern Washington can. Ford recommends seasonally adjusted diesel below 19°F and an engine block heater below -9°F, and notes that DEF can freeze below 12°F, which is why the truck heats its DEF system. If fuel gels, use Motorcraft anti-gel or an equivalent, never an alcohol-based additive.

Ford allows ultra-low sulfur diesel blended up to B20 in this engine. Red-dyed agricultural or off-road fuel and home heating oil are on Ford's do-not-use list.

Our technicians are factory trained and use genuine Ford parts. Once a repair falls outside the factory warranty, Clary Repair Protection puts a 2-year, unlimited-mile warranty on qualifying work; it doesn't apply to routine maintenance or factory warranty jobs. Service and parts financing spreads a bigger repair bill over time.

• Engine oil and filter, then a reset of the Intelligent Oil-Life Monitor
• Tire rotation and tread depth (front wheels only on dual rear wheel trucks unless the rears show unusual wear)
• Brake pads, rotors, linings, hoses and the parking brake
• DEF refill and a water separator drain if needed
• Coolant strength, level and hoses, plus the exhaust system and heat shields
• Front axle, U-joints, steering linkage, ball joints and tie-rod ends, with grease fittings lubricated where equipped
• Cabin and engine air filters

Ford's Diesel Engine Coverage on a 2026 Super Duty ends at 5 years or 100,000 miles, depending which you reach first. Besides the block, heads and internal parts, it lists glow plugs, injectors, the turbocharger, the high-pressure injection pump and a long run of engine sensors. The frame-mounted fuel conditioning module, fuel lines and fuel tank are left out of that extended coverage. Ford's base new-vehicle coverage runs 3 years or 36,000 miles, and powertrain coverage 5 years or 60,000 miles (Ford 2026 warranty guide).

To keep that coverage, Ford makes the owner responsible for maintenance as the manual describes and recommends keeping copies of every maintenance record and receipt. Ford also warns that biodiesel above B20, DEF that isn't certified and aftermarket exhaust changes can cause damage the warranty may not cover. Warranty repairs on a Ford go to a Ford dealership, and Bud Clary Ford is one. Planning to keep the truck longer? See Ford Protect extended service plans.

Shopping for your next truck? Browse new Super Duty pickups and our commercial vehicles, from chassis cabs to cutaways. Doing some of your own maintenance? Order parts from our parts department, including the filters and fluids Ford specifies.

Leaving the truck for the day? Ask for a ride on our free courtesy shuttle when you drop it off, and get picked up again when it's ready.