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What is the difference between SP-grade and SN-grade engine oil?

2 Answers

BenjaminAnn

09/06/25 4:56am

This classification comes from the American Petroleum Institute (API), where the preceding 'S' denotes oil specifically for gasoline engines, and the various letters following it represent oil standards. To date, there are 13 standards from SA to SP (SA, SB, SC, SD, SE, SF, SG, SH, SJ, SL, SM, SN, SP). The further the letter is in the alphabet, the higher the working capability of the oil under that standard, and the more recent the year it was introduced. For example, the SP standard was introduced in 2020. So, what are the differences between SP-standard oil and SN? The biggest difference between them is that SP-standard oil adds the feature of resisting low-speed pre-ignition, which can prevent the common low-speed pre-ignition and timing chain wear in small direct-injection engines, providing better protection. Additionally, SP-standard oil contains less phosphorus than SN-grade oil, ensuring improved lubrication while significantly enhancing the fuel economy of the engine. In terms of other capabilities, SP-standard oil also shows comprehensive improvements over SN oil, such as in engine cleanliness, noise reduction, power responsiveness, wear protection, and oxidation stability. Now, do you understand the difference between SP-grade and SN-grade engine oil?

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SanAnthony

09/18/25 4:48am

I've driven various car models and have gained some experience with oil changes. The main difference between SP-grade and SN-grade oils lies in the API standards they correspond to: SN is the older version from around 2011, while SP is the newer upgrade post-2020. SP is more effective in reducing low-speed pre-ignition issues, especially in modern turbocharged engines or high-performance vehicles, preventing engine knocking and damage at low RPMs. It also enhances oxidation resistance, meaning less sludge buildup and longer engine life. I've noticed that SP can slightly improve fuel economy, giving a bit more mileage per gallon in daily driving, which saves some money on gas in the long run. For new car owners or those driving compact SUVs, I recommend going straight for SP instead of opting for cheaper SN in sensitive engines to avoid costly repairs down the line.

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