What Is the Difference between 10w 30 and 10w 40?

Answer

In motoring, 10w 30 and 10w 40 are oil viscosity graders where 10w 30 is thicker than 10w 40. W means that oil viscosity has been tested at a colder temperature and the number without it means the oil has been tested at 100 °C which is the engine operating temperature.
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