Which is better, 75w90 or 80w90, the difference between 75w-90 and 80w-90

To change the gearbox oil, you need to select the appropriate model. Some gearbox oils have 75w90 and 80w90 logos. This is the viscosity grade of the gearbox oil. What is the difference between 75w-90 and 80w-90? Which is better, 75w90 or 80w90? Do you know all this? If you don't know, let's get to know it together.

Both 75w90 and 80w90 are SAE viscosity grades. Transmission oil can be divided into single-stage viscosity type and multi-stage viscosity all-weather type, and single-stage viscosity type can be divided into high temperature type and low temperature type. 75w90 and 80w90 belong to the multi-grade viscosity all-weather type, the difference between the two is the difference in low-temperature viscosity.

W means low temperature type winter use, the number in front of W means low temperature viscosity, the smaller the number, the greater the viscosity, the better the low temperature performance; the number behind W means the high temperature viscosity, the larger the number, the greater the viscosity, the better the high temperature performance. In other words, 75w90 and 80w90 have the same high temperature performance, while the low temperature viscosity of 75w90 is small, the fluidity is better, and the low temperature performance is stronger. The applicable temperature of 75W can be up to minus 45 degrees, and the applicable temperature of 80W is not lower than minus 35 degrees. Obviously 75w90 is better, and it is more suitable for areas with lower winter temperatures.