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What does the 5, W, and 30 mean in oil that has a viscosity rating of 5W- 30​
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What does the 5, W, and 30 mean in oil that has a viscosity rating of 5W- 30​

User Ernix
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The short answer:The numbers represent the viscosity of the oil and the W stands for WINTER. ... 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.

User Kronn
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