[Overspooled]

I usually have it parked in the garage, so I let it run for 3o seconds or so for the rpm's to drop. The other night, I left it outside overnight and when I started it, I let it run for 10 minutes. When I came back, it said that my oil was bellow minimum.. Drove to a car shop to get some oil and the oil level went back to half.. Weird.