What is the difference between 5w40 and 0w40?

1 Answers
JoyLynn
07/29/25 10:41pm
5w40 and 0w40 differ in their operating environments: 5w40 engine oil can ensure normal vehicle startup in temperatures as low as -30 degrees Celsius; 0w40 engine oil can function normally at -35 degrees Celsius. The 'w' stands for winter, and the smaller the number before it, the better the oil's low-temperature fluidity, indicating a lower usable environmental temperature and better engine protection during cold starts. The number after 'w' represents the oil's kinematic viscosity at 100 degrees Celsius. A higher number indicates higher viscosity, making it more suitable for vehicles operating under high-speed or extreme load conditions.
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