What does sn0w-20 mean?

[DavidLee]

sn and 0w-20 represent two different meanings. sn represents the API of the engine oil, while 0w-20 represents the SAE standard viscosity of the engine oil. API stands for the quality grade of engine oil, usually consisting of two letters. The first letter 'S' indicates gasoline engines, and 'C' indicates diesel engines. If both 'S' and 'C' are marked, it means the oil is suitable for both gasoline and diesel engines. The SAE standard viscosity value, where 'W' stands for winter, and the number before 'W' represents the lowest temperature at which the oil can be used. The functions of engine oil are: 1. Lubrication and friction reduction; 2. Assisting in cooling; 3. Sealing and leak prevention; 4. Rust and corrosion prevention; 5. Shock absorption and buffering.