Grip Addict wrote e90m3zcp wrote Got my E90 M3 back from it's second low mileage annual oil change during my ownership and discovered the joy of the hypersensitive oil sensor - oil level at min - add 1 quart warning. After calling around for 10W-60 at local auto parts stores, realized the only choice was to go back to the dealer for a quart. In the end, a great reason to drive more today. I don't recall this issue on my 2006 330. Why wasn't a dipstick enough?
My oil sensor isn't as hypersensitive as its like a cell phone battery......
Usually at 80%......then spends 90% of its life at 20% somehow...........then yells at you that it needs more.
I might just be fortunate with my sensor... I've definitely seen my fair share of M tax maintenance, but for some reason my oil sensor just keeps chugging along.. reliable and consistent. It reads the oil right on time, after op temp is reached every time. At 120K, I've never had an issue with it and it's saved me a few times. For several months I was losing a lot oil, and it ticked down until +1 warning two weeks in a row... Ended up being oil filter housing which was spewing oil everywhere, and needed a pricey fix. But since that repair a year ago, after a typical oil change, I stay at the top line just below overfill for 5K miles, dips a tad right before oil change due to weeping VC. But now those are fixed, so hopefully it never moves.
The point of saying this, if your oil sensor is giving inaccurate information consistently, personally I'd get it fixed, because they can work well.. and I'd be terrified not trusting mine.
knock on wood.