AMSOIL Gear Oil for Ford Super Duty Differentials
Choose differential fluid by the exact axle specification and see real-world front and rear service videos.
Front and rear axle requirements can differ
Gear oil protects ring-and-pinion gears, bearings and other differential components under high load. Towing can add significant load, but the correct viscosity and specification still come from the axle requirements.
Super Duty Front Differential Fluid Change
See front differential service on a Ford Super Duty and use the lookup to confirm the correct gear lubricant for the exact axle.
Super Duty Rear Differential Fluid Change
This companion video shows rear differential service and reinforces why front and rear axle specifications should each be verified.
Related AMSOIL guides
Frequently asked questions
What gear oil should I use in a Ford Super Duty differential?
The correct viscosity and specification depend on the axle, model year and use. Check the axle requirements and AMSOIL vehicle lookup rather than choosing gear oil by truck model alone.
Do front and rear differentials always use the same fluid?
Not necessarily. Axle designs and specifications can differ, so verify both axles independently.
Differentials carry the load of towing
Front and rear differentials transfer torque through heavily loaded gears and bearings. Towing, payload, large tires and extended highway heat can make axle-fluid condition especially important on a working Super Duty.
Front vs. rear
The front and rear axles may use different capacities or specifications. Confirm each axle separately.
Limited-slip requirements
Some differentials have friction-modifier requirements. Identify the axle type before selecting lubricant or additives.
Inspect during service
Check drained fluid and magnetic plugs for unusual metal, water contamination or signs of overheating.
Gear oil viscosity is application-specific
Do not assume a heavier gear oil is automatically better for towing. Use the viscosity and performance level required for the axle, then select a product that meets those requirements.