Which gear oil 85w140 or 85w90 is better?

Gear oil can be divided into single-stage viscosity type and multi-stage viscosity all-weather type, single-stage viscosity type can be divided into high temperature type and low temperature type. The high temperature type has a logo similar to SAE90, the low temperature type has a logo similar to SAE75W, and the multi-grade viscosity all-weather type has a logo similar to 80w90. Gear oils 85w140 and 85w90 belong to the multi-grade viscosity all-weather type, and the multi-grade viscosity all-weather type has a wider applicable temperature range. Wider and better.

Gear oil 85w140And 85w90Which is better

According to the viscosity classification standard of the American Society of Automotive Engineers (SAE), the viscosity of my country's vehicle gear oil is divided into seven viscosity grades: 70W, 75W, 80W90, 85W90, 85W140, 90, and 140. The W on the gear oil viscosity grade label indicates low-temperature gears. For oil, the number in front of W indicates low temperature viscosity. The smaller the number, the lower the viscosity, the better the low temperature fluidity and the stronger the low temperature performance. The number after W indicates the high temperature viscosity. The larger the number, the greater the high temperature viscosity and the better the temperature resistance. high.

In other words, gear oils 85w140 and 85w90 have the same low temperature viscosity, while 85w140 has a higher high temperature viscosity and a higher grade. In contrast, gear oil 85w140 is better.