I was going about 30 mph and depth finder showed 12 feet. I hit something in the river, probably a sandbar and alarm sounded and low oil light went on. Nothing was showing in the water like an oil leak. Motor ran fine. I pulled in to a dock and shut the motor off. Waited 10 minutes and started it again and no alarm or oil light. Motor still runs fine. Should I have it checked out or why isn't the low oil light going on if something is wrong?