I have an 87 cobra 3.0. Yesterday I fired it up for the 1st time this season. Gear oil was fresh as I changed it when I winterized the boat last fall. The boat started right up, but after I let it run for a while I checked the gear oil & it looked milky. I let it sit for a while so I could run some errands & when I returned the oil looked brand new. I suspect the oil is foaming up which makes it look milky. What would cause this? I wonder if the water pump is sucking air, but it performed fine & didn't overheat. I don't recall what brand of oil I used. Today, I'm going to reseal the water pump & see what that does. Any thoughts?
