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I switched to Mobile1 0w20 in my engine and had little noticeable gains (maybe 1-2% from Amsoil 5w20). I put the same Mobile1 0w20 in my transmission (after allot of research to confirm this choice) and seem to have gotten around 5% form this. It is hard to quantify the effectiveness accurately without strict testing, therefore I'm guessing that this is how much improvement is coming from these changes.
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