I have a question for you mechanics out there. I just started my outboard, it's a 1995 mercury 9.9hp. It starts up fine, seems to run good(in a trash can full of water) BUT.......there is a milky tannish color goo oozing from the exhaust. I'm hoping it's just because its been in storage for a couple of years, but I know better. So let me have the bad news. How bad is it?