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What is the grade of SP-grade engine oil?

1 Answers

DiAriel

07/29/25 9:03pm

SP-grade engine oil is currently the highest grade of gasoline engine oil. The meaning of SP in SP-grade engine oil: S represents engine oil for gasoline engines, P is the grade of the oil, and SP is the API index of the oil. The further the letter after S is in the alphabet, the higher the grade of the oil. SP represents the quality grade of the oil. SG, SJ, SL, SM, and the subsequent SP are all grades of automotive gasoline engine oil. SP is currently the highest grade of automotive gasoline engine oil. The higher the grade of the oil, the higher its various technical parameters, which can significantly extend the service life of the engine, increase the maintenance interval and inspection cycle, and reduce automotive maintenance costs. The difference between SN and SP engine oil: The difference between SN and SP engine oil lies in the thickness of the oil at a certain temperature, or in other words, the difference in viscosity. SN engine oil has relatively less phosphorus content; moreover, the viscosity comparison between SN and SP shows that SP has a slightly higher viscosity value, indicating that SP's oil film is stronger than SN's. SP offers better protective performance effects. At the same time, SP provides stable improvements over SN in terms of noise reduction, fuel consumption, and acceleration performance.

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