The viscosity is often measured at specific temperatures, such as 90°C and 100°C, denoted by numbers like 75W-90 or 85W-140. It is generally backward compatible with previous GL-3 formulations, allowing for a top-up without immediate adverse reactions.
High Temperature Stability of Gearbox Oil GL4
The anti-wear additives reduce friction, which translates to quieter gear changes and reduced energy loss. A multi-grade formulation like 75W-90 provides low viscosity during cold starts for easy pumping and reduced friction, while a higher viscosity at operating temperature maintains a strong oil film.
This grade is typically rated by the American Petroleum Institute (API) and exhibits a Medium Pressure (EP) performance level, making it suitable for moderate torque loads. Inspecting the fluid level and condition periodically can prevent premature gear failure and expensive repairs.
High Temperature Stability of Gearbox Oil GL4
These numbers indicate the oil's flow characteristics in cold starts and its stability at high operating temperatures, ensuring consistent protection across a wide thermal range. Most manufacturers recommend a drain and fill interval ranging from 30,000 to 60,000 miles, though this can vary based on driving habits and operating conditions.
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