What kind of oil does a Toyota differential take?
Most Toyota differentials use gear oil that meets the API GL-5 specification, typically in 75W-90 or 80W-90 viscosity. Always check your owner’s manual or the differential tag for the exact spec for your model and year.
Oil types and viscosities commonly used in Toyota differentials
The oil for Toyota differentials is not engine oil or transmission fluid; it’s dedicated gear oil. The following specifications cover the most common configurations you’ll encounter across models, including front, rear, and limited-slip differentials.
Here are the typical gear oil specs you’ll encounter:
- 75W-90 GL-5 gear oil — the default choice for many modern Toyota differentials, suitable for both front and rear diffs in many models.
- 80W-90 GL-5 gear oil — used in some older or specific Toyota configurations; ensure GL-5 rating is present.
- 75W-140 GL-5 gear oil — used in some heavier-duty or towing applications, or where a higher viscosity is required for limited-slip setups.
- Synthetic 75W-90 or 80W-90 gear oils — preferred by many owners for better cold-weather performance and longevity, though conventional oils of the same viscosity are acceptable if specified in the manual.
- Friction modifier (for limited-slip differentials) — if your Toyota has an LSD, you may need a compatible friction modifier additive; do not assume it’s unnecessary for all LSD-equipped axles.
Conclusion: The exact choice depends on your model/year and the differential’s configuration. Always follow the specification printed on the differential or in the owner’s manual, and apply any required additive only as recommended for LSD-equipped models.
How to confirm the right oil for your vehicle
To ensure you select the correct gear oil for your Toyota differential, take these steps: consult the owner’s manual or service information for your exact model and year; inspect the differential fill plug tag if present; ask a Toyota dealer or qualified mechanic; avoid using ATF or engine oil, and do not mix oil grades unless explicitly advised for your axle.
What to know about 4x4 and AWD systems
In 4x4 and AWD Toyotas, front and rear differentials may have different requirements, and some transfer cases use a different fluid altogether (often ATF or a dedicated transfer-case gear oil). Verify the specifications for each component separately to avoid incorrect fills.
Summary
In most Toyota differentials, you’ll use GL-5 gear oil in viscosities such as 75W-90 or 80W-90, with 75W-140 reserved for heavier-duty or certain LSD-equipped setups. Always check the owner’s manual or the differential tag for model-specific guidance, and follow any additive requirements if an LSD is present. Do not use engine oil or ATF unless the manual explicitly allows it.
Can I use 75w90 instead of 75W85 Toyota?
Yes, you can generally use 75W-90 instead of 75W-85 for most Toyota differentials, as the 75W-90 is a widely available and acceptable substitute. The main difference is that 75W-90 is slightly thicker at operating temperatures, but many mechanics and Toyota dealerships use it as a substitute because it's more common. It's crucial, however, to ensure the new fluid meets the correct GL rating (such as GL-5) for your vehicle's differential, as this is more important than the exact weight.
Key considerations
- Availability: 75W-85 is less common, making 75W-90 a practical alternative that is readily available at most auto parts stores.
- Viscosity: While 75W-90 is a bit thicker than 75W-85 at high temperatures, the difference is minimal and won't cause harm in most cases. Some sources even suggest that 75W-90 is preferable for heavy towing, although this is not always the case.
- GL rating: The most critical factor is the gear oil's GL rating, which specifies its suitability for different types of gears. Make sure the 75W-90 fluid you choose is compatible with your vehicle's requirements (e.g., GL-5 for most differentials).
- Additives: Be mindful of the additives, particularly for differentials with electronic lockers. Some oils may have anti-wear additives that can harm these components. It's best to stick to a fluid that is specified for your differential type.
- Performance: You might notice a slight decrease in fuel efficiency with the thicker 75W-90 fluid compared to the OEM 75W-85. However, this difference is usually minimal.
Recommendation
- If you can't find the 75W-85, a high-quality 75W-90 synthetic gear oil with the correct GL-5 rating is a perfectly acceptable substitute for most Toyota differentials.
- Some older or specific models might require a GL-4 rating for the transmission. Double-check your owner's manual to confirm the correct GL rating before making a purchase.
Does it matter what diff oil I use?
You will never feel any difference with new or old diff-oils, even with minor different viscosity or GL-spec. Differences, if any, will only present themself in the long run (durability related).
Is Toyota 75W85 gear oil synthetic?
GENUINE TOYOTA DIFFERENTIAL GEARBOX OIL. FULLY SYNTHETIC LT 75W-85. SUITABLE FOR MOST TOYOTA AND LEXUS VEHICLES.
What diff oil to use on a Toyota?
Best gear oil for 4th gen 4runner differentials and transfer case Toyota recommends using GL-5 75w-90 oil for both the transfer case and differentials. The Toyota branded gear oil is expensive though and in some cases, hard to find. It's fine to use 75w-90 synthetic gear oil from other brands.
