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winter
http://wiki.answers.com/Q/What_does_the_w_stand_fo...
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The 10 is the "weight" of the oil when it is cold, W. means winter, 30 is the weight
http://www.chacha.com/question/what-dose-10w30-sta...
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The "W" in 10w30 stands for Winter, and means that the first number...
http://www.chacha.com/question/what-does-the-w-in-...
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Weight is what people usually think of, but it's "winter.". Those oils are rated for winter use.
http://answers.yahoo.com/question/index?qid=200905...
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