Jun 30, 2012 #one There are plenty of water-in-the-oil threads so I just assumed I'd toss this to choose from. Any water indicates a seal is leaking, and it could be as simple as an oil fill plug seal or as challenging as a prop shaft seal. The key is https://cashykxgo.life-wiki.com/1471831/a_review_of_mercury_outboard_motors_south_africa