Is 5w40 thicker than 5w30?

The working viscosity of 5w30 is essentially 9.3 to 12.5 mm2, while the working viscosity of 5w40 is 12.5 to 16.3 mm2. This means that 5w40 has a viscosity greater than 5w30. Thus, 5w30 is better than 5w40.

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