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How to Differentiate Engine Oil Grades?

1 Answers

DelBraxton

07/29/25 7:20pm

Engine oil grades are classified based on quality and viscosity ratings. Oil for gasoline engines is typically denoted by the letter 'S', while oil for diesel engines is represented by the letter 'C'. Below is more detailed information about engine oil and its grades: 1. Engine oil consists of base oil and additives. The base oil is the main component of lubricating oil, determining its fundamental properties, while additives help improve the shortcomings of the base oil. 2. The specifications for 'S' series oils include: SA, SB, SC, SD, SE, SF, SG, SH, SJ, SL. 3. The specifications for 'C' series oils include: CA, CB, CC, CD, CE, CF, CF2, CF4, CG4, CH4, C14. 4. As the letters progress, the oil grade becomes higher. When both letters appear, it indicates that the oil is universal and can be used for both gasoline and diesel engines.

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