How are SN oil grades classified?

[Jared]

S-series represents oil for gasoline engines, classified from SA to SN grades: SA, SB, SC, SD, SE, SF, SG, SH, SJ, SL, SM, SN. Below is relevant information: 1. SN is a grade of oil quality. The S-series represents oil for gasoline engines, generally classified from SA to SN grades: SA, SB, SC, SD, SE, SF, SG, SH, SJ, SL, SM, SN. The later the letter, the higher the grade. 2. SN engine oil primarily improves in terms of high-temperature cleanliness, while SL-grade engine oil does not have very high high-temperature cleanliness. Turbocharged engines are more suitable for SN-grade engine oil. 3. SN oil has stronger anti-wear properties and provides better protection for the three-way catalytic converter. SL only requires phosphorus content not to exceed 0.1%, whereas SN-grade engine oil has particularly high requirements for phosphorus content.