Tonight I was getting off the freeway after being on there for about 20 minutes, and I pulled into a gas station. After filling up I was pulling out and my Low Oil Light came on and stayed on...so I turned the car off and everything seemed normal, oil pressure was normal, I know the oil level was fine because I checked it the other day. I turned it on and there was no light, and drove it another 20 minutes home with no problems. Is there a reason for this? I wasn't driving the car hard before the light came on...any ideas why this happened?