i had a customer whos boat sank partially. the engine did not submerge. it's a 175 merc. 5 months later he has yet to pay his bill. he informed me that he had water in his oil(from sinking) and burned his powerhead sometime later. he only ran the boat for five minutes. we billed him for pumping out the boat and cleaning the hull and repairing the leak. no water in the fuel or oil tank. i figured the volume of oil in the line from the remote tank to the engine tank to be about 12 oz. he would have had to burn about 4.5 gallons of gas in five minutes to pump water to his engine tank. ( i doubt that) he would have also had to seal what ever leak allowed the water to enter the remote tank in order for it to pressurize the system. he didn't inform me of any problems until i chained his boat to the slip. (after 5 months) the way i see it water in the oil is not a possibility. i would like some input from others. thanks