[11' AW M3]

Hey guys, how dangerous is it to drive with the oil level too high? I had oil level at the minimum, so I added a quart as it stated neccesary, but the oil sensors showed that it only went up midway (between min and max). This was a day later. So I decided to add another quart, and now today it showed that its over the max. I wish this car just had a normal dipstick! I guess the reading after the first top off wasn't accurate. I have driven approx. 20 miles with the oil at this level, and I need to drive another 30 before I can get to the dealer- is it safe to do so? I was told by a buddy of mine to just drive cautiously and shift early...