Which is better, SN grade or SL grade engine oil?

[DeTyler]

SN grade is currently the highest grade of engine oil, so SN grade engine oil is superior to SL grade. The higher the grade, the better the oil. Engine oil grades are classified as SA, SB, SC, SD, SE, SF, SG, SH, SJ, SL, SM, and SN, with the letter further down the alphabet indicating a higher grade. Here is some relevant information about engine oil grades: 1. API certification refers to the American Petroleum Institute standards, and the SN and SF grades commonly seen on engine oil packaging fall under this standard. 2. The letter "S" indicates that the oil is suitable for gasoline engines, commonly referred to as "gasoline engine oil." The second letter represents the quality performance level of the oil, with letters further down the alphabet indicating higher quality performance.