What does SAE mean?

[Georgia]

SAE refers to the viscosity grade classification of gear oil. Gear oil can be divided into single-grade viscosity type and multi-grade viscosity all-weather type. The single-grade viscosity type can be further categorized into high-temperature type and low-temperature type. The multi-grade viscosity all-weather type is labeled similarly to SAE80W90, where the number before the slash indicates the low-temperature viscosity performance in winter—the smaller the number, the lower the low-temperature viscosity, resulting in better fluidity and enhanced low-temperature resistance. The number after the slash represents the high-temperature viscosity performance—the larger the number, the higher the high-temperature viscosity, providing better resistance to high temperatures. Gear oil is a high-viscosity lubricant primarily used in automotive transmissions to lubricate various gears in the gearbox, reducer, and differential, preventing gear surface wear, scuffing, and seizing, thereby extending service life and improving power transmission efficiency.