I happened to be at Mobil buying butts and I was browsing the oil I have to buy tomorrow for a change. The dude at BMW, based on the climate where I live right now and my driving style said 10w-40, or 15w-50 would be good. They had 5w-30, 0w-40, or 15w-50. My question is, what the hell is 0W-40?? I assume not the same thing but I don't know. Any help, as usual, greatly appreciated fellas.
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