Just choose 75W85 gear oil, which is completely suitable for the gearbox. The gear oil needs to be replaced every two years or every 4, kilometers.

the p>API divides automobile gear oil into two grades, namely GL-4 and GL-5. GL-1, GL-2 and GL-3 have already been eliminated. However, GL-3 gear oil still occupies a considerable market share in China.

The gasoline engine oil supplied in the market is printed with certain labels on the packaging barrels, such as 1W/3 and 15W/4, indicating the quality grade and viscosity grade of the product, which is the international general classification standard for automobile engine oil.

gasoline engine oil is classified as s SEries, which is classified into SA, b, SC, SD, se, SF, SG, SH, SJ, etc. according to product performance, and the product quality is improved in turn, that is, the quality grade of SA is the lowest, and that of SJ is the highest.

about the meaning of letters and numbers

S= gasoline engine oil f = quality grade 1w-3 = viscosity grade (multi-grade oil)

The viscosity grade of gasoline engine oil is mainly selected according to the working condition and ambient temperature of the engine:

It is recommended that the main viscosity grade oil is suitable for engine oil with temperature of 5w/3-35 to 1

.

Extended information:

When gear oil works, its working temperature is generally 1℃ ~ 8℃ due to the constant change of gear working surface. Secondly, gear oil bears high pressure.

when the gear is in transmission, the unit pressure of the meshing part between teeth is as high as (196~245)×1kPa, while the unit pressure of hyperbola gear can reach (294~392)×1kPa. In addition, gear oil works under the conditions of great speed change and many revolutions, so gear oil is easy to be squeezed out from the gap between teeth, resulting in semi-liquid friction.

the main requirements for gear oil are that a continuous and tough oil film can be formed on the contact surface between teeth, that is, it has high oiliness, so that a tough boundary oil layer can be maintained between transmission parts, so as to ensure small wear of transmission parts and prevent them from scratching;

in addition, the gear oil should also have good viscosity-temperature characteristics, so as to ensure that the friction loss of the power transmission mechanism is small, improve the transmission efficiency, and ensure that the automobile is easy to start (especially in winter).

Baidu encyclopedia-automobile gear oil