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How Often Should Gear Oil Be Replaced?

1 Answers

McLawson

07/25/25 8:51am

Gear oil should be replaced approximately every 40,000 kilometers to effectively improve the efficiency of power transmission from the engine. Currently, there are mainly two types of gear oil: synthetic oil and mineral oil. Synthetic oil has a long lifespan and does not need replacement within 200,000 kilometers, whereas mineral oil is different, requiring replacement every 2 to 3 years or every 40,000 to 60,000 kilometers. Different types of transmissions and drive axles use different viscosity grades. Small passenger vehicles typically require a viscosity grade of 75w90, while large trucks and drive axles need 80w90. Gear oil should possess excellent anti-wear and load-bearing properties, along with suitable viscosity. Additionally, it should have good thermal oxidation stability, anti-foaming properties, water separation performance, and rust prevention capabilities.

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