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Originally Posted by JFP in PA
The"W" stands for "winter" or cold weather viscosity/weight; a "0W-40" oil has "0" in the cold.
I would not use any oil with a "0W" rating, regardless of maker. We only use a 10W-40 full synthetic with ACEA A3, B3, B4 ratings in all our customer's cars, and it gets really cold here....................
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Cool, thanks, hey what does the 40 stand for?