What does API SN grade mean?

[ElisaRose]

The meaning of API SN grade is as follows: 1. API is the abbreviation for the American Petroleum Institute, and the API grade represents the quality grade of engine oil, using simple codes to describe the working capability of engine oil. 2. SN is a category of API engine oil, representing a grade of oil quality. Below is the relevant introduction to API oil classification: 1. The "S" series represents oil for gasoline engines, with specifications including: API SA, SB, SC, SD, SE, SF, SG, SH, SJ, SL, SM, SN. 2. The "C" series represents oil for diesel engines, with specifications including: API CA, CB, CC, CD, CE, CF, CF-2, CF-4, CG-4, CH-4, CL-4. 3. When both "S" and "C" letters are present, it indicates that the oil is suitable for both gasoline and diesel engines.