2021 Ford F-250 Super Duty Fluid Type Specs
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Quick reference
| Fluid | Type/Spec | Capacity |
|---|---|---|
| Engine Oil | 6.7L Power Stroke Diesel: SAE 10W-30 (CK-4), WSS-M2C171-F1<br>7.3L Godzilla V8: SAE 5W-30 (API SN Plus/SP), WSS-M2C961-A1<br>6.2L Boss V8: SAE 5W-30 (API SN Plus/SP), WSS-M2C946-B1 | 6.7L: 13 quarts (12.3 liters)<br>7.3L: 7.5 quarts (7.1 liters)<br>6.2L: 7 quarts (6.6 liters) |
| Engine Coolant | Motorcraft Orange Prediluted Antifreeze/Coolant, WSS-M97B44-D2 | ~19-20 quarts (Varies, refer to owner's manual) |
| Transmission Fluid | TorqShift 10-speed (10R140): MERCON ULV (Ultra Low Viscosity)<br>TorqShift 6-speed (6R140): MERCON LV (Low Viscosity) | TorqShift 10-speed: ~19 quarts (18 liters) (dry fill)<br>TorqShift 6-speed: ~17.5 quarts (16.6 liters) (dry fill) |
| Transfer Case | Motorcraft XL-12, MERCON LV | ~2 quarts (1.9 liters) |
| Front Differential | Dana M275/M300: SAE 75W-85 GL-5, WSS-M2C942-A<br>Ford 44/60-series: SAE 80W-90 GL-5, WSS-M2C924-A (may vary) | ~3-4 quarts (varies by axle) |
| Rear Differential | Dana M275/M300: SAE 75W-85 GL-5, WSS-M2C942-A, with friction modifier if Limited Slip<br>Ford 10.5/12-series: SAE 75W-140 GL-5, WSS-M2C192-A, with friction modifier if Limited Slip | ~3.5-4.5 quarts (varies by axle) |
| Brake Fluid | Motorcraft DOT 4 Low Viscosity (LV) Motor Vehicle Brake Fluid, WSS-M6C65-A2 | ~1 quart |
| Power Steering Fluid | Hydraulic power steering (if equipped): MERCON LV (Low Viscosity)<br>Electric Power Assisted Steering (EPAS): No fluid needed, refer to owner's manual for specific system type | ~1 quart (for hydraulic system) |
| Washer Fluid | Motorcraft Premium Windshield Washer Concentrate, Motorcraft Premium Windshield Washer Fluid | ~1 gallon (3.8 liters) |
| DEF (Diesel Exhaust Fluid) | DEF (Diesel Exhaust Fluid), ISO 22241 (API certified) | 7.5 gallons (28.4 liters) |
Introduction: The Lifeblood of Your 2021 Ford F-250 Super Duty
Your 2021 Ford F-250 Super Duty is a robust workhorse, engineered for demanding tasks and long hauls. To maintain its legendary reliability and performance, using the correct fluids is paramount. This comprehensive guide outlines all factory-spec fluids for your F-250, including types, specifications, capacities, and important notes to help you keep your truck running optimally for years to come.
Engine Oil
The heart of your F-250 relies on precise lubrication. Ford specifies different engine oils depending on the engine. Always consult your owner's manual for the most accurate information for your specific vehicle.
- 6.7L Power Stroke Diesel: For the mighty 6.7L Power Stroke diesel engine, Ford recommends SAE 10W-30 engine oil that meets the API CK-4 service category and Ford specification WSS-M2C171-F1. Look for oils specifically labeled
More specs for the 2021 Ford F-250 Super Duty
Oil Capacity & Filter
Capacity, weight, filter PN, drain plug torque, change interval.
Coolant Capacity & Type
Total system capacity, OEM coolant spec, flush interval, bleed tips.
Transmission Fluid & Service
Trans model, fluid spec, capacity, filter PN, service interval.
Torque Specifications
Lug nuts, drain plug, caliper, axle nut, plug, key fasteners.
Brake Pad & Rotor Specs
Pad PNs, rotor size, min thickness, caliper torque.
Tire Size & Pressure
OEM size, cold psi, bolt pattern, wheel size, TPMS.
Battery Size & Group
Group size, CCA, AGM/flooded, dimensions, reset note.
A/C Refrigerant & Oil
R-134a or R-1234yf, charge oz, PAG oil spec.
Bulb Sizes (Headlight, Tail, Fog)
Headlight, fog, tail, turn, reverse, interior.
Factory Maintenance Schedule
Service intervals by mileage, severe-duty notes, known issues.
Towing Capacity & Payload
Max tow, payload, GVWR/GCWR, hitch class by trim.
Fuse Box Diagram & Amperage
Fuse box locations, layout, amps, and what each fuse controls.
Serpentine Belt Routing & Length
Belt routing, length, rib count, OEM + aftermarket PNs.
Wheel Alignment Specifications
Camber, caster, toe ranges (front & rear), adjustability notes.
Paint Color Codes
All factory colors with paint codes, sticker location, touch-up tips.
Wiper Blade Sizes
Driver/passenger/rear blade size, attachment, OEM + cross-refs.
Spark Plug Type & Gap
Plug PN, gap, torque, interval by engine.
Transmission & Axle Gear Ratios
Trans gear ratios, axle ratios, RPO codes, tow vs MPG impact.
Key Fob Programming
DIY programming steps, FCC ID, fob PN, battery, transponder.
Same spec — other model years
2000 F-250 Super Duty
2001 F-250 Super Duty
2002 F-250 Super Duty
2003 F-250 Super Duty
2004 F-250 Super Duty
2005 F-250 Super Duty
Maintenance & repair guides
2021 Ford F-250 Super Duty Maintenance Schedule →
Available maintenance guidance; confirm the manufacturer schedule.
Repair planning references →
Plan the scope of work; detailed procedures need configuration-matched evidence.
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Values can vary by engine, trim and build date; check your VIN-specific service information. Updated 2026-07-06.