What is the meaning of engine oil grade?
1 Answers
The meaning of engine oil grade refers to the viscosity and quality of the oil. The quality grades for gasoline engine oils are classified as: SA, SB, SC, SE, SF, SG, SH, SJ, SL, SM, with quality increasing from left to right. The 'S' stands for gasoline engine oil, and the following letters represent the grade. The low-temperature viscosity grades are: 0W, 5W, 10W, 15W, 20W, 25W, where a smaller number indicates better cold-start performance at low temperatures. 'W' is the abbreviation for 'winter,' indicating low-temperature performance. For example, 0W oil will freeze at -35 degrees Celsius, while 5W oil will freeze at -30 degrees Celsius.