Maintenance Schedule 2026 Ford F-550 · 6.7L V8 Power Stroke
Normal Service Severe Service
The 2026 F-550 6.7L Power Stroke diesel requires more frequent service than gasoline engines, with particular attention to fuel filters, DEF system, and DPF maintenance under normal driving conditions.
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⚙️ Engine
Engine oil and filter
5,000 mi / 6 mo
OLP recommends 5,000 mi even when manufacturer claims longer — extended-interval programs shorten engine life. Ford specifies 10,000 mi for normal service but 5,000 is safer for diesel longevity.
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Fuel filter replacement
15,000 mi
Critical for diesel fuel system protection. More frequent replacement recommended if using biodiesel blends or low-quality fuel.
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Engine air filter
30,000 mi
Inspect at every oil change; replace when dirty or restricted.
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Crankcase breather filter
67,500 mi
Part of CCV (Closed Crankcase Ventilation) system. Replace as part of scheduled maintenance.
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Accessory drive belt inspection
100,000 mi / 120 mo
Inspect at every oil change for cracks, glazing, or fraying. Replace as needed or at 100K miles.
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PCV valve inspection
100,000 mi
Inspect and clean or replace as needed. Critical for controlling blow-by on high-mileage diesels.
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🔩 Drivetrain
Driveshaft U-joints and slip yoke
10,000 mi / 12 mo
Inspect for wear and lubricate grease fittings if equipped.
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Automatic transmission fluid and filter
50,000 mi
TorqShift 10R140 transmission. Ford specifies 50K miles for normal service in commercial chassis applications.
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Front differential fluid
50,000 mi
Use Motorcraft SAE 75W-140 synthetic rear axle lubricant or equivalent meeting Ford spec.
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Rear differential fluid
50,000 mi
Use Motorcraft SAE 75W-140 synthetic rear axle lubricant or equivalent meeting Ford spec.
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Transfer case fluid (4WD)
50,000 mi
Only if equipped with 4WD. Use Motorcraft transfer case fluid.
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Wheel bearing inspection and repack (if serviceable)
50,000 mi
Many F-550 applications use sealed bearings; inspect for play or noise at regular service intervals.
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🛞 Brakes
Brake system inspection
10,000 mi / 12 mo
Inspect pads, rotors, drums, lines, and parking brake.
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Brake fluid replacement
36 mo
Use DOT 4 LV brake fluid. Critical for maintaining ABS and stability control function.
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💧 Fluids
Cooling system hoses and clamps inspection
10,000 mi / 12 mo
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Engine coolant replacement
100,000 mi / 120 mo
Use Motorcraft Yellow concentrated coolant (VC-7-B) for 6.7L Power Stroke. Initial fill is good for 10 years/100K miles.
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🛞 Tires
Dual rear wheel setup requires careful attention to tire wear patterns.
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🔍 Inspection
Steering linkage and suspension inspection
10,000 mi / 12 mo
Critical on heavy-duty chassis; inspect ball joints, tie rods, and bushings.
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Body and hinge lubrication
10,000 mi / 12 mo
Lubricate door hinges, latches, hood hinges, and tailgate hinges.
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⚡ Electrical
Battery performance test
12 mo
Dual-battery system; check connections and load test both batteries.
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💨 Exhaust
Exhaust system and heat shield inspection
10,000 mi / 12 mo
Includes DPF and SCR catalyst inspection for damage or leaks.
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EGR system inspection
97,500 mi
Inspect EGR cooler and valve for carbon buildup. Clean or service if performance issues develop.
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DEF (Diesel Exhaust Fluid) system
as needed
Top off as needed (typically every 5,000-10,000 miles). System monitors level; use only ISO 22241-compliant DEF.
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DPF (Diesel Particulate Filter) service
as needed
Automatic regeneration occurs during normal operation. Manual regeneration or cleaning required only if warning light appears.
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❄️ HVAC
Cabin air filter
20,000 mi
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About this schedule: AI-generated to match the manufacturer's published recommendations for this exact engine. Severe-service intervals apply if you frequently make short trips, drive in dusty conditions, tow, or deal with extreme heat or cold. Always consult your owner's manual for warranty-required services.