What level is SN on engine oil?
1 Answers
SN on engine oil belongs to the second-grade gasoline engine oil level. Currently, the main gasoline engine oils still in use are SJ, SL, SM, and SN, with the highest grade being SP. Engine oils starting with "S" are specifically for gasoline engines and cannot be used in diesel vehicles. When choosing engine oil, you should not only consider what types of vehicles SN-grade oil is suitable for but also its viscosity. Even within the same SN grade, there can be different viscosity indices. The viscosity determines the oil's high and low-temperature performance, with the low-temperature flow characteristics and high-temperature viscosity determining the applicable range of the oil.