hi guys, quick 2 questions. I have a 1969 55hp evinrude, and when I start it up it begins to leak oil from behind the prop. I've read all the threads I could about residue burn off, that could be it because I don't know the history on how the previous owner used the motor. I've heard it's from trolling for long periods of time. So I'm wondering how long will it take to clean out or is there a way that I can clean it out?<br />Secondly, The oil drips down onto the ground, and when I rev the motor the oil really starts driipping, So am I still ok? Or might it be a lower gear case seal? My gear oil is clean as a whistle, but this stuff is black. Any help will do I'm newly married and want to take my wife out fishing for her first time.