I have noticed that the oil is milky white and extremely thin in my 898 Mercruiser I/O. I changed the oil and noticed it was much more then 5 quarts. As soon as I started it with the new oil (after hooking up the hose to the outdrive, because it's on a trailer now) the oil turned milky even worse. Prior to storing the boat in my yard, it ran perfectly well and was in the water for the entire season. But sitting out of the water since Nov 2008 must have done something because I am now having a major problem. I have pulled the intake manifold off, to take a look but before I pull the heads off, I heard that the exhaust manifold may have something to do with this. I also noticed the milky oil at the top of the dip stick tube almost bubling.
Can someone shed some light on this?