What does 20w40 engine oil mean?

1 Answers
Ezekiel
07/25/25 4:34pm
20w40 engine oil means that the minimum applicable temperature of the oil is -15°C, Winter, and the kinematic viscosity of the oil at 100°C is 14.5cst. The following is relevant knowledge about oil grades: Low-temperature fluidity of engine oil: The W in the grade stands for Winter, and the number before W represents the low-temperature fluidity of the oil. The smaller the number, the better the low-temperature fluidity. Oil viscosity grade: The number after W represents the oil viscosity grade at 100°C. The larger the number, the better the protection the oil provides to the engine at high temperatures. Specific meaning of oil grade: 20W40 oil is suitable for use in environments with temperatures above -15°C, so it can be used all year round in southern regions. However, it is not suitable for winter in northern regions such as Harbin where temperatures are relatively low.
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