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Can SN and SP engine oils be mixed?

1 Answers

DelMartin

07/29/25 4:15pm

Whether SN and SP engine oils can be mixed. SP represents the quality grade of engine oil, with SG, SJ, SL, SM, and the subsequent SP being grades for gasoline engine oils. SP is currently the highest grade for gasoline engine oils. The higher the grade of the oil, the better its various technical indicators, which can significantly extend the engine's service life, prolong oil change intervals and maintenance cycles, and reduce car maintenance costs. The difference between SN and SP engine oils lies in the thickness (or viscosity) of the oil at a certain temperature, which can also be described as the difference in phosphorus content. Below is a detailed introduction: 1. SN engine oil has a relatively lower phosphorus content; moreover, in terms of viscosity comparison between SN and SP, SP has a slightly higher viscosity value; 2. This indicates that SP's oil film is stronger than SN's, offering better protective performance. Additionally, SP provides stable improvements over SN in terms of noise reduction, fuel consumption, and acceleration performance.

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