I have a 1996 mercury xr6 150 and i am getting the beep-beep-beep-beep when i start the engine. I am pretty sure this means an oil problem and i have checked the tank on the motor and the reserve tank in the boat. Both are completely full. Had the boat out on the lake the other day and was fine all day until I went to come in and as i was in the idle zone, the beeping started, so i immediatly shut it down and trolled in. I know there are other possibilities, but if you could possibly give me a good place to start i would really appreciate it. Thanks in advance. Also, is it ok to just premix the gas until i can get the problem resolved?