I filled it with Mobil 1 synthetic oil about 1000 miles ago. The light has been coming on intermittently the past couple of weeks. I checked it it wasn't all that low, but I added more. Light still keeps coming on once in a while. Today it came on at start, drove it for an hour. Started it back up and the light was gone. WTF? I know the oil level is fine, what can be triggering it?