What Does Engine Oil Grade Mean?

1 Answers
Isabela
07/29/25 9:36pm
Engine oil grade consists of two parts: classification and viscosity specification, which generally indicate viscosity and quality. The viscosity of engine oil is often identified using SAE grades. SAE is the abbreviation for the "Society of Automotive Engineers" in English. The "W" stands for winter, and the smaller the number before it, the better the low-temperature fluidity of the oil, indicating a lower usable environmental temperature. The number after it represents the oil's high-temperature resistance. Engine oils are specifically classified into 4 types for summer use, 6 types for winter use, and 16 types for all-season use. The summer oil grades are: 20, 30, 40, and 50, with higher numbers indicating greater viscosity. The winter oil grades are: 0W, 5W, 10W, 15W, 20W, and 25W.
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