The lower unit is seperate from the rest of the motor and its a sealed unit. As far as the water for the cooling, it all drains out when you pull the boat out of the water. Running your motor out of the water will damage your water pump. Not going fishing can cause personal distress. I say go freeze your butt off for a couple of hours, then come in and warm up and do it again. Your brain will be froze and forget all that pre-season stress that you are going through.