What kind of fluid does a Toyota rear differential take?
Most Toyota rear differentials require gear oil that meets the GL-5 specification, typically in 75W-90 or 80W-90 viscosity. Do not use automatic transmission fluid. Always verify the exact specification in your owner’s manual or on the differential tag.
The exact fluid for a Toyota rear differential depends on the model, year, and axle type (open, limited-slip, or Torsen). Some Toyotas also require an LSD friction modifier if the axle is equipped with a limited-slip differential. The following guide outlines common options and how to confirm the correct spec for your vehicle.
Common fluid options for Toyota rear differentials
Before listing, note that the options below cover typical Toyota rear differentials; always confirm your car’s exact spec in the manual or on the axle tag.
- 75W-90 gear oil that meets GL-5 specification (synthetic or conventional) — the most common recommendation for many Toyota rear differentials, especially in 4x4s and SUVs.
- 80W-90 gear oil that meets GL-5 specification — used on some models or in specific climates where a thicker oil is preferred.
- 90 weight gear oil meeting GL-5 or SG specifications — encountered on some older Toyotas or certain axles; less common in newer models.
- Friction-modifier additive for LSD — if the axle is an LSD, you may need to add the manufacturer’s required LSD modifier to the gear oil; check the owner’s manual for exact requirements.
Conclusion: The standard choice for most Toyota rear differentials is GL-5 gear oil in 75W-90 or 80W-90. Always follow the exact specification for your vehicle and use the appropriate LSD additive if required.
How to verify the right fluid for your vehicle
To ensure you use the correct fluid, locate your owner’s manual section on the rear differential or look for a tag on the differential cover that lists the fluid type and capacity. If in doubt, consult a Toyota service manual or contact a dealer for model-year guidance.
Steps to confirm and service
Check the manual for the exact viscosity and GL rating; inspect the differential cover tag if present; obtain a compatible gear oil (commonly 75W-90 or 80W-90 GL-5) and, if required, the LSD friction modifier. When servicing, drain the old fluid completely, replace the drain plug seal if needed, and refill to the proper level with the correct oil.
Summary
In summary, most Toyota rear differentials use GL-5 gear oil in a 75W-90 or 80W-90 viscosity. Verify the exact spec for your model-year from the owner’s manual or a dealer, and account for any LSD requirements. Avoid using ATF unless the manual explicitly allows it.
