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The W is implies as winter. Basically on the coldest day of the year in winter 5w-30 will have the viscosity of 5 weight oil of that particualr temp. (no temp is specified) and a the second 2 digit number is the viscosity at 100 degrees centigrade

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Q: What does the w mean in 5w30 oil?
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The "W" stands for weight. The "W" stands for winter. 5w30 is a multi viscosity oil. It acts like both 30 weight in warm weather, and 5 weight oil in cold weather.


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