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What is the difference between SN and SL engine oil?

1 Answers

VanBrody

07/29/25 3:31pm

Engine oil SL and SN refer to the quality grades of engine oil. The most obvious difference between SN and SL oil is the grade difference, which also corresponds to variations in various performance aspects of the oil. Below are the differences between SN and SL engine oil: 1. Differences in oxidation resistance and anti-wear performance under high-temperature and high-speed operating conditions: For example, in the same TEOST MHT high-temperature deposit test: The SN standard requires no more than 35 milligrams; SN oil has higher high-temperature cleanliness than SL, making it particularly suitable for turbocharged engines. SN-grade oil offers better oxidation stability and anti-wear performance. Since SN oil contains lower levels of phosphorus and zinc compared to SL oil, it reduces wear on the three-way catalyst. 2. Different environmental protection levels of the oil: In the quality grades, the further the letter is in the alphabet, the higher the environmental protection level. Therefore, SL oil has a lower environmental protection level than SN, and the highest environmental protection level is SP-grade oil. 3. Classification by quality level: SG, SH, SJ, SL, SM, SN, so SN has a higher quality than SL. 4. Difference in availability: The number of SL-grade oils available for sale is fewer than SN.

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