How to Identify Engine Oil Viscosity Grades?

1 Answers
LaJulia
07/29/25 7:13pm
10W-40 is the SAE viscosity grade of engine oil. This viscosity value first indicates that the oil is a multi-grade oil. The symbol W stands for winter. The smaller the number before W, the lower the low-temperature viscosity, the better the low-temperature fluidity, and the lower the applicable minimum temperature. The number after W is an indicator of the oil's high-temperature resistance. The larger the number, the better the oil's protective performance at high temperatures.
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