Gear oil uses gl4 or gl5, the difference between gear oil gl4 and gl5

Transmission oil is also called gear oil. The American Petroleum Institute has divided the API performance of gear oil, which can be divided into GL-1, GL-2, GL-3, GL-4, GL-5, GL-6, etc. Level, the gear oil outer packaging has the corresponding level mark. Among them, GL-1, GL-2, and GL-3, which are heavily loaded, have been eliminated on the market, and currently GL-4 and GL-5 are commonly used in family cars. Many car owners don’t know whether to use GL-4 or GL-5 for their car’s transmission oil. There is a difference between the two. What is the difference between GL-4 and GL-5 gear oil?

The difference between gear oil GL-4 and GL-5

GL-4 is a medium-duty gear oil, suitable for differential gears, transmission gears and steering gears; GL-5 is a heavy-duty gear oil, suitable for differential gears and rear axle gears with particularly harsh working conditions. According to the grade of gear oil, GL-5 grade is higher than GL-4, and the price of GL-4 is lower than GL-5. GL-5 contains more sulfur and more acidity than GL-4. GL-4 or GL-5 should be used as the transmission oil, which should be selected in accordance with the provisions in the gearbox and the car manual. Generally, GL-4 transmission oil is more suitable for household cars.

Different types of transmission oil cannot be mixed, because the flow rate, viscosity, density, friction performance and expansion coefficient of different types of transmission oil are different. Some manufacturers have introduced gearbox oils that match them according to the characteristics of the transmission. It is recommended that car owners go to the 4S shop to replace it or purchase the corresponding model for replacement.