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How are automotive oil grades classified?

1 Answers

JeremiahLee

07/25/25 6:19am

Automotive oils are divided into gasoline engine oils and diesel engine oils. The classification includes two aspects: quality grade and viscosity grade. For passenger cars, for example, in northeastern regions, 5W-30 or 5W-40 is recommended; in southern regions, 10W-40 or 15W-40 is suggested. Below is some relevant information about automotive oils: 1. Quality grade of automotive oils: In terms of quality grade, the API (American Petroleum Institute) classification includes SA, SB, SC, SD, SE, SF, SG, SH, SJ, SL, SM, and SN grades. When selecting oil, it is essential to strictly follow the oil grade specified in the vehicle's user manual. If the same grade is not available, a higher grade can be used, but never use a lower grade as a substitute. 2. Viscosity impact of automotive oils: The SAE viscosity classification for summer oils includes grades 20, 30, 40, and 50. The higher the number, the greater the viscosity, and the higher the maximum applicable temperature.

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