We were lucky last year, we did not get allot of snow and I think there was about one month where the field was covered with snow that was deep enough to not fly so I got in roughly 700 flights on about 7 different planes. Some of these were trim flights to the tune over about 30 - 50 flights for each plane while running through a trim sheet. Some were more and some were less. No real need to do that with a 4* but the really good aerobatic one really benefit from it.

I do agree, I think we should all move south to florida and call ourselves the "transplant club"

Now for the question, I never once took out anything from the planes in regards to the engine. I did what everyone already suggested and added light oil after running them dry, but I wrapped the engine while still mounted in a freezer bag. Once a while I would go and turn it over a few times to keep the oil spread out plus for the glow engines I stored them nose down to keep the oil in the bearings.

I'm paranoid about batteries, and since I fly allot over the flying season I just replaced them with new ones when spring comes around. It's expensive, but since I fly larger planes then it's well worth my piece of what little mind I have left. Now this winter will be different since all but one of my planes are now on Lith-Ion packs. These will get removed and stored in the house.