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Old 01-05-2008, 05:40 PM   #1
70' GMC
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Join Date: Oct 2006
Location: Birmingham AL
Posts: 2,488
Exclamation What the W means on the oil!!!

I read on a calender which is auto related, and it said that the "W" meant winter NOT weight. So if it says 10W or 20W it means 10 degrees in winter or 20 degrees in winter. I hope someone has some more info on this.
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