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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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If 5w30 is listed as an acceptable oil in the owners manual, then yes.If 5w30 is listed as an acceptable oil in the owners manual, then yes.


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What do you mean by newer oil? If you are talking about the weight of the oil, use exactly what the owner's manual states. If it says use 5w30, then use 5w30. If you are referring to synthetic oil, yes you can use synthetic as long as you use the correct weight.


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