Is 10W-40 engine oil for winter or summer use?

1 Answers
GemmaRose
07/30/25 12:53am
10W-40 is the SAE standard viscosity value, where W stands for WINTER. 10W-40 engine oil can be used in winter. For 10W-40 automotive engine oil, it can generally be used normally at temperatures ranging from below zero to above 20 degrees. Additional information is as follows: Winter oil models include 0W, 5W, 10W, 15W, 20W, and 25W. The smaller the number before W, the lower the viscosity at low temperatures, the better the flow performance at low temperatures, and the lower the minimum suitable temperature. The number after W indicates the oil viscosity at 100°C.
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