Re: oil light on and off...even after oil change
A 2 MPG penalty just in switching weights? That's a little extreme. My wife's car has been running on 5w40 for over 100K miles (since new) and she gets 27MPG with a rating of 23C/29H. Then again, it's all been synthetic oil, so maybe using synthetic counteracts some power sapping of running 40 weight. But I still don't see a 10% difference. That's extreme.
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