What does SAE mean?
2 Answers
SAE stands for the Society of Automotive Engineers, which refers to the viscosity grade classification of gear oil. Here are the detailed explanations: 1. Gear oil can be divided into single-grade viscosity type and multi-grade all-weather type. 2. The single-grade viscosity type can be further divided into high-temperature type and low-temperature type. 3. The high-temperature type has labels like SAE90 and SAE140, where the number after SAE indicates the oil viscosity at 100°C. A larger number indicates higher oil viscosity. The low-temperature type has labels like SAE75W, where W stands for low-temperature type, and 75 is the viscosity. A smaller number indicates better low-temperature performance. 4. The multi-grade all-weather type has labels like SAE80W/90. The number before the slash indicates the low-temperature viscosity performance in winter, where a smaller number means lower low-temperature viscosity, better fluidity, and better low-temperature resistance. The number after the slash indicates the high-temperature viscosity performance, where a larger number means higher high-temperature viscosity and better high-temperature resistance.
SAE stands for the Society of Automotive Engineers, a global engineering organization founded in 1905, primarily responsible for establishing and promoting automotive engineering-related standards. It is most commonly seen on motor oil, such as the SAE 5W-30 labeled on bottles, where SAE refers to the viscosity grading system, helping car owners understand the oil's flow characteristics in both cold and hot weather. For example, the number 5 before the 'W' indicates the oil's thinness at low temperatures—the smaller the number, the better it is for smooth winter starts. The number 30 after the 'W' represents the high-temperature viscosity, with higher values offering better engine protection. Choosing the wrong SAE grade can lead to engine wear or increased fuel consumption, so it's essential to check the vehicle manual during every oil change. SAE standards also apply to coolants and gear oils, ensuring compatibility and safety across different brand components. As a non-profit organization, SAE continuously updates its standards to advance automotive technology, making driving more reliable and worry-free.
