I have a 2010 175 hp Mercury Optimax 1B789623. It started alarming by beaping 4 times, which I'm led to believe is an oil warning issue. This alarm repeated every two minutes and was consistent while returning from fishing. The small on-board oil tank is full and the tank in the boat is 3/4 full. I loosened the small tank's screw cap and oil flowed out while the motor was running. Would this be an issue with the float in the little tank or something else?