I discovered water in oil in my Yamaha F200XB - oil like a uniform white color and gaining about a cup in volume after an hour at cruising speed. Engine is 2014 with 215 hrs. We have done all the normal things - thermostat, pressure control valve, took lower unit apart and changed oil pan gasket, head gasket replaced, checked water/exhaust cooler. Nothing has solved the problem. Boat runs great compression is 140 psi (cold) in all 4 cylinders, pistons all looked good with same amount of light carbon. Out of ideas - hoping it is not a cracked block somewhere but that seems like only thing left. Any one have any other ideas for us to check?
