I have been enjoying my first boat for a month now. Its a 1994 Glastron with a Mercruiser 3.0LX. I've been noticing a milky discharge once I open the drain plug after use. Lately it seems to be a little thicker. The gear lube level is about 1/4 inch below the full line in the reservoir and doesn't seem to be getting any lower. Any thoughts on what it could be? thanks