What standard is Castrol SP?

1 Answers
ColemanLynn
07/30/25 10:08am
Castrol SP is the SP standard. The API (American Petroleum Institute) specifies that oils starting with 'S' represent gasoline engine oils. The grades of gasoline engine oils, from low to high, are: SF, SG, SJ, SL, SM, SN. Grade classification: Engine oils range from 'SA' to 'SN'. With each increasing letter, the performance of the oil improves over the previous one, containing more additives to protect the engine. The further back the letter, the higher the quality grade. Most international brands have oil grades above SF. Gasoline classification: Automotive engine oils are specifically classified into 4 types for summer, 6 types for winter, and 16 types for all-season use.
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