An internet friend sent me this chart . It pretty much backs up what I've been saying all along about the poor cold performance of some 15w-40's out there and even the Mobil Delvac 5w-40 vs the Mobil 0w-40 when used in gasoline engines . Some of these oils are grease at very low temps .
I once heard an oil pump say OUCH Well I actually heard that from another oil pump who heard it from a bearing
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