The difference between transmission oil 75w80 and 75w90

Some gearbox oil packages have the marks 75w80 and 75w90, which are the marks of the viscosity grades of gear oils. According to the viscosity grades, gear oils can be classified into single-stage viscosity type and multi-stage viscosity all-weather type, of which single-stage viscosity type can be divided into For high temperature type and low temperature type.

Transmission oil 75w80And 75w90the difference

75w80 and 75w90 are actually the markings of multi-grade all-weather transmission oils. According to the classification of viscosity, the viscosity of gear oils of Chinese vehicles adopts the American Society of Automotive Engineers (SAE) viscosity classification method, which is divided into 70W, 75W, 80W, 85W, 90 , 140, 250 seven viscosity levels, the letter W (Winner) represents winter use, the number before W represents low temperature viscosity, the smaller the number, the lower the low temperature viscosity, the better the fluidity; and the number after W represents the high temperature viscosity performance, The higher the number, the higher the high temperature viscosity and the more high temperature resistance. That is to say, the difference between transmission oil 75w80 and 75w90 is that under the same low temperature viscosity, the high temperature viscosity of 75w90 is larger and the viscosity is better.

In addition, the American Petroleum Institute has also divided the API performance of transmission fluids, which can be divided into performance levels such as GL-1, GL-2, GL-3, GL-4, GL-5, and GL-6. There is also a corresponding grade mark on the outer packaging of the transmission oil. Different models have different gearboxes, and the gearbox oils used are also different, with different performances. Don't mix them.