What is API Oil Classification?

1 Answers
LaAdalynn
07/30/25 10:34am
API oil classifications include SA, SB, SC, SD, SE, SF, SG, SH, SJ, SL, SM, and SN. Below is relevant information: API Introduction: API stands for the American Petroleum Institute, the first national-level commercial association in the United States and one of the earliest and most successful standard-setting trade organizations worldwide. The API oil standard refers to the specifications established by this institute for engine oils. API Letter Representation: In the API standard, the letter "S" denotes gasoline engines, while "C" represents diesel engines. The subsequent letters indicate the oil's classification level—the later the letter appears in the alphabet, the higher the grade and quality of the lubricant. Currently, SN is the highest classification for gasoline engine oils in the API standard.
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