The oil I drained fron the lower unit of my 5 hp (I think) Sea king is clowdy (like a light mustard color). I assume that there is some water getting into the unit. I read that there is a possibility that it is not water, but rather air (in some engins). 1. How can I tell if it's water or air? 2. If it turns out to be water in the lower unit is it bad for the engine if I keep using the unit and repaire in in the fall without causing additional dammage?