How to Distinguish Engine Oil Grades?

[DeLuke]

Methods to distinguish oil grades: 1. Oil grades are classified according to quality grades and viscosity grades. Oil for gasoline engines is usually represented by the letter "S", while oil for diesel engines is usually represented by the letter "C"; 2. Engine oil is composed of base oil and additives, where the base oil is the main component of the lubricating oil, determining its basic properties, and additives can improve the shortcomings of the base oil; 3. The specifications of the "S" series include: SA, SB, SC, SD, SE, SF, SG, SH, SJ, SL; 4. The specifications of the "C" series include: CA, CB, CC, CD, CE, CF, CF-2, CF-4, CG-4, CH-4, CI-4; 5. Generally, as the letters increase, 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; 6. For viscosity, the SAE standard is often used, for example: 10W-40. The "W" stands for winter, and the number before the letter represents the fluidity of the oil. The smaller the number, the better the fluidity.