What Does 10W30 Engine Oil Mean? How is it Different Than 5W30 Oil?

10W30 Engine oil

The 10W30 designation on engine oil means that the viscosity of the oil is rated at 10W when an engine is cold, and 30 when the engine is hot. This is different than an oil labelled 5W30, which has a thinner viscosity when the engine is cold at 5W.

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