How is gasoline engine oil classified?
1 Answers
Gasoline engine oil is classified as follows: 1. Classification according to SAE viscosity grades: Engine oil is classified by SAE viscosity grades, with 6 types for winter, 5 types for summer, and 16 types for all-season use. The 6 winter grades are 0W, 5W, 10W, 15W, 20W, and 25W, where 'W' stands for Winter. The smaller the number before 'W', the better the oil's fluidity at low temperatures, making it suitable for colder environments. The 5 summer grades are 20, 30, 40, 50, and 60. The larger the number, the higher the oil's viscosity and the better its high-temperature protection performance, making it suitable for hotter environments. The 16 all-season grades are 5W20, 5W30, 5W40, 5W50, 10W20, 10W30, 10W40, 10W50, 15W30, 15W40, 15W50, 20W20, 20W30, 20W40, and 20W50. 2. Classification according to API quality grades: API quality grades divide engine oil into S-series and C-series. The S-series denotes gasoline engine oil, while the C-series denotes diesel engine oil. If labeled with both S and C, it indicates the oil is suitable for both gasoline and diesel engines. Each series is ordered alphabetically (A, B, C, D, E, F, etc.), with later letters indicating higher grades and better performance. Current gasoline engine oil grades include SA, SB, SC, SD, SE, SF, SG, SH, SJ, SL, SM, SN, and SP; diesel engine oil grades include CA, CB, CC, CD, CD-II, CE, CF-II, CF-4, CG-4, CH-4, and CI-4.
