Hey guys I just got a 1988 sea ray with a 4.3 v6. The boat was givin to me because of some engine problems but I got it going. Here is the problem, I know nothing about boats and can't figure out how to check the oil in the outdrive unit. I see a small screw plug at the very bottom and one at the top that says vent. I'm guessing the one at the top that says vent is the fill but how do I know how much to put in it? If I were to fill it till it ran out of the hole that seems like a lot of oil. Is this how I do it though? thanks in advance for anybody that can help me with this..