What does SN0W20 engine oil mean?

[Heidi]

SN0W20 engine oil represents the following meanings: 1. The 'S' at the beginning stands for gasoline engine oil, and the following letters from A, B, C, D... to N indicate that the higher the letter, the higher the grade. 2. 0W represents -35°C, and 20 refers to the oil grade. 3. 'W' stands for winter, and the smaller the number before it, the better the low-temperature fluidity of the oil, indicating a lower usable environmental temperature and better protection for the engine during cold starts. The number after 'W' (after the dash) is an indicator of the oil's high-temperature resistance, with a larger number indicating better protection performance at high temperatures.