I'm new to boating and trying to winterize my boat. I have a 1989 force 85hp (856a9c). It seems like I accidently removed the shift pivot screw the lower unit instead of the drain plug. I was luckily able to get the screw back in but want to make sure I'm doing this correctly. Oil drained out of shift pivot screw plug when I removed it. The oil that drained out is gear oil right? I can just fill the oil from the fill plug on the top of the lower unit? I believe the actual drain plug is on the very bottom of the lower unit. Thanks for any help