SAE is the English abbreviation of the Society of Automotive Engineers, and the SAE rating represents the viscosity grade of the oil. SAE30 and SAE40 are single-stage oils, and SAE10W-30 and SAE15W-40 are multi-grade oils. Among them, the smaller the number in front of "W", the lower the low-temperature viscosity, the better the protection ability of the engine during cold start; the number behind "W" is the indicator of the high temperature resistance of the oil.
According to the SAE method, there are 6 types of oil for winter use, 4 kinds of oil for summer use, and 16 kinds of common oil for winter and summer.
★The winter oil brands are: 0W, 5W, 10W, 15W, 20W, 25W. The symbol W stands for winter. The smaller the number before W, the lower the low temperature viscosity, the better the low temperature fluidity, and the lower the applicable minimum temperature. ;
★The summer oil brands are: 20, 30, 40, 50. The larger the number, the higher the viscosity, the higher the applicable maximum temperature;
★The winter and summer general oil brands are: 5W/20, 5W/30, 5W/40, 5W/50, 10W/20, 10W/30, 10W/40, 10W/50, 15W/20, 15W/30, 15W/ 40, 15W/50, 20W/20, 20W/30, 20W/40, 20W/50.
The smaller the number representing the winter part, the higher the number representing the summer part, and the higher the applicable temperature range.