How to Differentiate Engine Oil Grades?

[OCameron]

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 usually marked with the letter C. Engine oil consists of base oil and additives, where the base oil is the main component of the lubricant, determining its fundamental properties, and additives are used to compensate for the shortcomings of the base oil. The specifications for S-series oils include: SA, SB, SC, SD, SE, SF, SG, SH, SJ, SL. The specifications for C-series oils include: CA, CB, CC, CD, CE, CF, CF2, CF4, CG4, CH4, C14. As the letters progress, the grade of the oil increases. When both letters appear, it indicates that the oil is universal and can be used for both gasoline and diesel engines.