How to Choose Gear Oil for Trucks?

1 Answers
AdamFitz
07/30/25 5:50am
Correct selection of gear oil for trucks is as follows: 1. Determine the quality grade of the oil based on the gear type and working conditions. The selection of gear oil quality grade should be based on the type of main reducer gear and its working conditions. If the main reducer is a hypoid gear with a tooth surface load exceeding 2000MPa, sliding speed over 10m/s, and oil temperature as high as 120~130°C, heavy-duty vehicle gear oil containing a large amount of extreme pressure additives must be used. 2. Determine the viscosity grade based on the minimum ambient temperature and the maximum operating temperature of the gear transmission. The selection of gear oil viscosity grade mainly depends on the ambient temperature. In southern China, No. 90 or No. 140 oil can be selected. In the cold regions of northeast and northwest China, No. 80W/90 or No. 75W/90 oil is suitable, while in other central regions, No. 85W/90 or No. 85W/140 oil is recommended.
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