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What is the difference between SN and SP engine oil?

1 Answers

VonEmerson

07/29/25 10:36pm

Here are the specific differences between SN and SP engine oils: 1. Grade: SN is the second-highest grade for gasoline engine oils; SP is currently the highest grade for gasoline engine oils. 2. Oil film: SN has a relatively weak oil film; SP has a stronger oil film. 3. Protective performance: SN offers average protective performance; SP provides stronger protective performance. Below is extended information on engine oil quality grades: 1. API grades: API stands for the American Petroleum Institute. API grades represent the quality levels of engine oils, using codes to describe their working capabilities. The grades range from SA, SB, SC, SD, SE, SF, SG, SH, SJ, SL, SM, to SN, with letters further in the alphabet indicating higher grades. SP is currently the highest grade. SJ was the standard in the 1990s, SL in 2001, SM in 2004, and SN in 2010. 2. Engine oil grades: As the highest grade, SP engine oils are generally classified as full synthetic oils. Semi-synthetic oils are mostly SL or SM grade, with some SN grades. International brands typically offer oils at SF grade or above. For example, Shell Helix Ultra is API-SM grade, while Shell Helix Red is API-SG grade, indicating that Helix Ultra has a higher quality grade than Helix Red.

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