What is the difference between Castrol 5w30 and 0w40 engine oil?

1 Answers
VictoriaFitz
07/30/25 12:24am
The difference between Castrol 5w30 and 0w40 engine oil lies in their viscosity and the lowest temperature they can withstand. Difference in viscosity: The numbers 40 and 30 after 5W represent viscosity. The larger the number, the higher the viscosity and the higher the maximum applicable temperature. Difference in the lowest temperature they can withstand: The smaller the number before W, the lower the low-temperature viscosity and the better the low-temperature fluidity, meaning it can be used at lower minimum temperatures. 0W40 can be used at lower temperatures than 5W30. Using engine oil with a lower number before W makes it easier to start the engine in cold weather, depending mainly on the vehicle's operating environment.
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