What is the difference between engine oil C3 and C5?
1 Answers
C3 and C5 refer to the testing and certification standards for automotive lubricants set by the automobile manufacturing industry. C5 is the highest grade in this series of standards, corresponding to the best oil quality and performance, while C3 ranks third in the grade hierarchy. The standards for defining engine oil are as follows: 1. API Grade: The API (American Petroleum Institute) oil grade is an American standard, classified using two letters. It is used to determine the performance level of the oil and the applicable model years of vehicles. The current API-SM classification was adopted in 2004. 2. SAE Viscosity Grade: SAE specifies 11 oil viscosity grades, indicating which grade of oil should be used at what atmospheric temperature. Among these 11 grades, 6 are winter oils, denoted by the letter W, including 0W, 5W, 10W, 20W, and 25W. The number before the W indicates the lowest temperature at which the oil can be used, with smaller numbers corresponding to lower temperatures. For example, SAE 0W is suitable for a minimum temperature of -35 degrees Celsius, SAE 5W for -30 degrees Celsius, and so on. Summer oils are not denoted by letters but are directly marked with numbers, including 20, 30, 40, 50, and 60, which represent the maximum temperature at which the oil can be used.
