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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 The letter “W” itself stands for Winter. …
Read More »What do the numbers and letters mean on motor oil?
