I have a 2005 Nissan 18 HP four stroke with about twenty properly broke in hours. Since new I have had a problem on start-up. About 60% of starts the oil light will not go out, or it will go off after the computer finishes its check, then it will come on again. I always shut down the engine quickly when this happens. But, if I restart the engine it always behaves normally. I am an aircraft mechanic and I am big on preventitive maintenance. I changed the oil and filter after five hours, then chaanged them both again after ten hours. I run the motor at half throttle, and I treat it very gently. After break-in I began using Amsoil oil. It dosn't smoke, use, or leak oil. The engine is fine except this weird oil light problem. I really don't think it is an actuall oil pressure problem, but I could be wrong. The water that is expelled from the engine is never really hot, just warm. This tells me that the engine isn't running hot due to poor lubrication. Any help would be appreciated.
