What got me was I changed the oil, added 9 quarts, went to get gas, and the car reported on the oil level like it does when you get gas, and the lower bar was flashing indicating I was low (the oil was up in the engine still, I didn't give it enough time to come down), so I went home and it took another quart to get it to what I thought was the right level... Now I only check the oil after the car has been sitting level overnight, or at least for an hour or two after driving the car enough to get the oil hot. Otherwise I don't believe the gauge...
