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How Many Kilometers Should Manual Transmission Gear Oil Be Changed?

1 Answers

HarleyMarie

07/30/25 12:01am

Manual transmission gear oil is generally changed every 60,000 kilometers, which can effectively improve the efficiency of gear transmission of engine power. Gears are mechanical components with teeth on the rim that can continuously engage to transmit motion and power. They are toothed mechanical parts that can mesh with each other, with the diameter of the large gear being twice that of the small gear. Gear Oil Classification: Currently, the viscosity classification of domestic vehicle gear oils adopts the SAE viscosity classification, which can be divided into seven viscosity grades: 70W, 75W, 80W90, 85W90, 85W140, 90, and 140. SAE is the gear oil viscosity grade classification standard established by the Society of Automotive Engineers (SAE). W indicates low-temperature gear oil, 80 represents low-temperature viscosity—the smaller the number, the lower the viscosity, the better the fluidity, and the stronger the low-temperature performance. 90 represents high-temperature viscosity—the larger the number, the higher the high-temperature viscosity, and the higher the temperature resistance. API Performance Classification of Gear Oil: The American Petroleum Institute (API) has classified the performance of gear oils into levels such as GL-1, GL-2, GL-3, GL-4, GL-5, and GL-6, with corresponding labels on gear oil packaging. Among these, GL-1, GL-2, and GL-3, which are more focused on heavy-duty use, have been phased out in the market. Currently, GL-4 and GL-5 are commonly used for household vehicles. GL-5 is a higher grade than GL-4, and GL-4 is less expensive than GL-5. GL-5 contains more sulfur and is more acidic than GL-4, making GL-4 transmission oil more suitable for general manual transmission household cars.

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