How to Identify Engine Oil Grade?

[SanAugust]

To identify the engine oil grade, note that oil grades range from SA to SN, with this designation indicating the oil quality. The further the letter after 'S' is in the alphabet, the higher the oil quality. Engine oil grades are categorized as follows: 1. 'S' stands for gasoline engine oil, and 'L' represents the grade. The later the letter, the higher the oil grade. 2. 'C' stands for diesel engine oil, and 'F' represents the grade. Similarly, the later the letter, the higher the oil grade. The functions of engine oil include: 1. Reducing friction and high temperatures; 2. Minimizing gas leakage and preventing contamination from external pollutants; 3. Protecting against contact with water, air, and acidic harmful gases; 4. Cushioning the pressure rise in the engine cylinder; 5. Cleaning dirt generated on the working surfaces of components.