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What does 10w40 engine oil mean?

1 Answers

Xavier

07/30/25 4:59am

Synthetic engine oil 10w-40 refers to the SAE standard viscosity value of the oil. The "W" stands for winter, and 10W represents resistance to external low temperatures of -25°C. Below is a detailed introduction to the types of engine oil models: 1. High-temperature type (such as SAE20-SAE50): The number indicates the viscosity at 100°C, with higher numbers representing higher viscosity. 2. Low-temperature type (such as SAEOW-SAE25W): W indicates it is only for winter use, and the smaller the number, the lower the viscosity and the better the low-temperature fluidity. 3. All-season type (such as SAE15W/40, 10W/40, 5W/50): Indicates that the viscosity grade at low temperatures meets the requirements of SAE15W, 10W, and 5W respectively, and the viscosity grade at high temperatures meets the requirements of SAE40 and 50 respectively, making it suitable for both winter and summer use.

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