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Which is better 5w30 or 10w30?
A higher viscosity oil, such as 10w30, will flow slower at low temperatures compared to a lower viscosity oil like 5w30. … A higher viscosity or thicker oil will seal better than a low viscosity oil. A thicker oil will also provide better lubrication of critical engine parts.
What is 10w 30 oil used for?
The "W" in 10W-30 oil stands for "weight." Oil changes its viscosity with temperature and the single viscosity rating only represents the flow of oil when it's warm. When you buy engine oil, it's important to know the oil's viscosity, a property that corresponds roughly to its thickness.
What does 5w 30 mean?
In a 5W-30 for example, the number before the W describes the viscosity of the oil at low temperatures. The lower the number, the thinner the oil and the better the oil's cold temperature/ cold start performance. The number after the W describes how thick the oil is at the engine's normal operating temperature.