What's the difference between 0w30 and 0w40?

1 Answers
MacRowan
07/30/25 5:27am
0w30 and 0w40 differ in their high-temperature viscosity: 0w30 has a high-temperature viscosity of 30, while 0w40 has a high-temperature viscosity of 40. The letter 'w' in the oil grade stands for 'winter', indicating that the oil can be used normally in winter. The number before 'w' represents the low-temperature flow performance. 0w means the oil can flow normally at -35 degrees Celsius, and 5w means it can flow normally at -30 degrees Celsius. The number after 'w' indicates the high-temperature viscosity of the oil, with a higher number representing higher viscosity.
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