"0W-40 for me. You’re only handicapping yourself and potentially harming your car by running 5W-30 or 5W-40".
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Check the NOACK of your 0W-40, bet it is higher than let's say the BMW OIL 5W-30 or better yet PP EURO 5W-40. Matching your viscosity to the environment in which you drive is a good recommendation.
0W only for the really cold temps say below 20F.
Cheers