2021 Ford F-150 Transmission Fluid & Service
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Quick Answer
- Transmission Make/Model: Ford 10R80 10-speed automatic
- OEM Fluid Spec: MERCON ULV (Ultra Low Viscosity)
- Drain & Fill Capacity: Approximately 6-8 quarts (varies, always check dipstick/level)
- Full Overhaul Capacity: Approximately 13.1 quarts (12.4 liters)
- Filter OEM Part Number: ML3Z-7A098-A (verify with dealer or service manual)
- Recommended Service Interval:
- Normal Duty: 150,000 miles (fluid and filter)
- Severe Duty/Towing: 60,000 – 100,000 miles (fluid and filter), depending on usage
Fluid Type Explained: MERCON ULV
For your 2021 Ford F-150 equipped with the 10R80 10-speed automatic transmission, the only factory-recommended transmission fluid is Motorcraft MERCON ULV (Ultra Low Viscosity). It is critical to use only this fluid type. Do not substitute with MERCON LV, MERCON V, or any other fluid, as this can lead to serious transmission damage and void your warranty. The 10R80 transmission is designed with very tight tolerances and specific friction material compounds that require the precise lubricating and friction characteristics of MERCON ULV fluid. Using the wrong fluid can lead to harsh shifts, slippage, overheating, and premature wear of internal components.
MERCON ULV is a full synthetic blend engineered to provide optimal performance, fuel efficiency, and protection for modern Ford automatic transmissions. Its low viscosity helps reduce parasitic losses within the transmission, contributing to the F-150's overall fuel economy.
Service Procedure: Drain & Fill vs. Full Exchange
Servicing the 10R80 transmission typically involves a drain and fill procedure, along with replacing the transmission filter. A full fluid exchange (or
More specs for the 2021 Ford F-150
Oil Capacity & Filter
Capacity, weight, filter PN, drain plug torque, change interval.
Fluid Type Specs
Engine oil, coolant, ATF, diff, brake, PS, DEF — with OEM spec numbers.
Coolant Capacity & Type
Total system capacity, OEM coolant spec, flush interval, bleed tips.
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
Maintenance & repair guides
2021 Ford F-150 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 2026-06-23.