What is the meaning of 85w90 gear oil, the difference between 85w90 and 80w90

There are many types and grades of gear oils. Different types and grades are suitable for different car models. Suitable gear oils should be selected for different environments. For these types of gear oils, a friend asked what 85w90 gear oil means. In fact, this is a kind of viscosity grade identification. There are not only 85w90 but also 80w90 gear oils. What is the difference between 85w90 and 80w90?

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. 85w90 gear oil is a multi-grade all-weather type with a wider practical temperature range and can be used throughout the year. The W on the gear oil viscosity grade label indicates low temperature gear oil, the number before W indicates low temperature viscosity, the smaller the number, the lower the viscosity, the better the fluidity, and the stronger the low temperature performance. The number after W indicates the high temperature viscosity. The higher the number, the higher the high temperature viscosity and the higher the temperature resistance.

The difference between 85w90 and 80w90 lies in the difference in low temperature viscosity. 85w90 and 80w90 have the same high temperature viscosity. Compared with 85w90, 80w90 has lower low temperature viscosity and better fluidity of gear oil. It can be used at lower temperatures and has stronger low temperature performance. .