What does 15w40 engine oil mean?

1 Answers
MadisonMarie
07/24/25 1:28am
15w40 engine oil means: 15 indicates that the applicable temperature of the oil is above minus twenty degrees Celsius; w stands for winter; 40 represents the viscosity of the oil. The higher the number, the greater the viscosity of the oil, the better the high-temperature protection performance, and the greater the corresponding resistance. This 15w40 oil is mainly used in high-temperature environments and situations where the engine has high requirements for oil viscosity. In China, few car models are recommended by the manufacturer to use 15w40 oil. 15w40 oil can generally be used for European and German cars, provided that the ambient temperature is not too low. Engine oil is a lubricant that can lubricate and reduce wear, assist in cooling, seal and prevent leaks, prevent rust and corrosion, and provide shock absorption for the engine.
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