What does sn0w-20 mean?
3 Answers
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.
In my understanding, terms like SNOW-20 typically refer to engine oil viscosity grades, which are quite common in the automotive field. The SAE viscosity standard uses numbers to indicate performance. For example, in 5W-20, the 'W' stands for Winter, and the preceding number like 5 indicates low-temperature fluidity—the smaller the number, the better, meaning it can remain fluid at temperatures as low as -30°C, aiding smooth engine operation during cold starts. The number 20 represents the viscosity rating at high temperatures, such as 100°C, where a lower number indicates a thinner oil film, reducing friction and improving fuel efficiency. Choosing the correct engine oil is crucial, especially when driving in winter. Using the wrong grade can accelerate engine wear or increase fuel consumption, so it's best to check the vehicle manual for recommended types or consult a professional mechanic for regular maintenance.
I've encountered many car owners asking what the oil code means, such as something like SNOW-20. From a usage perspective, it's actually part of the oil viscosity rating. The number before the W indicates better oil flow in cold weather, allowing the car to start quickly and preventing engine damage, while the number after (like 20) shows that the oil film is thinner at high temperatures, protecting the engine while saving fuel. For example, using 5W-20 in northern winters works well. I've personally seen a friend struggle with morning starts due to choosing the wrong viscosity oil. Always match the oil to your vehicle and climate—it saves hassle and extends your car's lifespan.
