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What does SF in engine oil represent?

1 Answers

Lindsey

07/29/25 11:23pm

Engine oil S represents gasoline engine oil, and F represents the quality grade. Below is a detailed introduction to engine oil grades: 1. C stands for diesel engine oil: From CA, CB, CC, CD, CE, CF, CF-4, CG-4, CH-4, CI-4, to CJ-4, the further the letter in the sequence, the higher the oil quality grade. Generally, CD grade oil is used for diesel engines, while turbocharged diesel engines require higher quality oil, with -4 indicating that the oil is suitable for 4-stroke diesel engines. 2. S stands for gasoline engine oil: API engine oils are divided into two categories. The S series represents oils for gasoline engines, with specifications including SA, SB, SC, SD, SE, SF, SG, SH, SJ, SL, SM, and SN. 3. When both S and C letters are present: It indicates that the oil is suitable for both gasoline and diesel engines.

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