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What is the difference between SP and SN engine oil?

2 Answers

LeilaniRose

07/29/25 3:59am

The differences between SN and SP engine oil are as follows: 1. Different viscosity levels: The difference between SN and SP engine oil lies in their thickness or viscosity (phosphorus content) at a certain temperature. SN engine oil has a relatively lower phosphorus content. 2. Different viscosity numbers: Comparing the viscosity of SN and SP oils, SP has a higher viscosity number, indicating that SP has a stronger oil film than SN, providing better protective performance. Additionally, SP offers stable improvements over SN in terms of noise reduction, fuel consumption, and acceleration performance. SP represents the quality grade of engine oil. Grades such as SG, SJ, SL, SM, and the subsequent SP are all classifications for gasoline engine oils, with SP currently being the highest grade. The higher the grade of the engine oil, the better its various technical indicators.

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McLeilani

08/12/25 7:45am

I've changed engine oil quite a few times. Both SP and SN are actually API (American Petroleum Institute) standards, with the main difference being that SP is newer and better. SN was introduced around 2010 and is considered an older standard, suitable for regular engines. SP is the 2020 upgrade specifically designed for modern technologies like turbocharged or direct injection engines – it helps reduce LSPI (low-speed pre-ignition) issues to prevent engine knocking. Additionally, SP offers better protection: less wear, improved oxidation resistance, reduced sludge formation, and longer oil life. Why the upgrade? Because modern cars are more complex – SP enhances fuel efficiency, saving you some gas money. When choosing oil, check your manual or vehicle year: post-2017 models generally support SP, while older cars do fine with SN. SP is slightly more expensive but offers better long-term engine protection. Don't forget regular dipstick checks – never rely solely on standards. Overall, SP is more advanced and ideal for performance-oriented owners.

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