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What does CF in engine oil represent?

1 Answers

DelCorey

09/06/25 3:36am

SN is the engine oil for gasoline-powered vehicles. CF indicates engine oil for diesel-powered vehicles. For detailed information, please see below: 1. API engine oils are divided into two categories: The "S" series represents oils for gasoline engines, with specifications including: API SA, SB, SC, SD, SE, SF, SG, SH, SJ, SL, SM, SN. The "C" series represents oils for diesel engines, with specifications including: API CA, CB, CC, CD, CE, CF, CF-2, CF-4, CG-4, CH-4, CI-4. When both "S" and "C" letters are present, it indicates that the oil is suitable for both gasoline and diesel engines. 2. The "S" series represents oils for gasoline engines, generally ranging from SA to SN in order (following alphabetical order, but excluding SI). Each subsequent letter indicates better performance than the previous one, with more additives in the oil to protect the engine. The further back the letter, the higher the quality grade. Most international brands of engine oil are above SF grade.

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