What does the API of engine oil represent?

1 Answers
McEva
07/29/25 4:49pm
The API grade of engine oil refers to the quality standard specified for engine oil. Below is relevant information: 1. The first letter of the specification for engine oil used in gasoline engines is "S", with a total of 12 grades from SA to SN. The first letter of the specification for engine oil used in diesel engines is "C". If the engine oil label is "SC", it indicates that the oil is universal, meaning it can be used in both gasoline and diesel engines. 2. Taking gasoline engines as an example, the engine oil grades used in gasoline engines, from low to high, are SE, SF, SG, SH, SJ, SL, SM, and SN. As of August 2019, most of the engine oils used in cars in China were SJ, SL, SM, and SN.
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