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Old 07-30-2007, 11:55 PM
jestal jestal is offline
LawnSite Member
Join Date: Jul 2007
Location: milford, michigan
Posts: 7
"W" in 10W30 oil definitely stands for Winter. People have used W to stand for weight in casual conversation but in the API oil classifications the W is clearly for "winter" to delineate the "cold" oil viscosity as it would be in the winter.
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