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Q. If you were to mix 10W -30W with 15W -40W what would you get for W?

August 28, 2013

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A. Depending on the proportion of the each that you mix, the results will vary. By mixing two different products, the end result no longer either grade, but something in between. Without knowing the exact proportions, and even brands, there is no way to for sure.

So summarize it would not be 12.5W -35W.

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Mark Betner

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Citgo Lubricants
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