Winter storage...
Guy,
Just turn the props by hand as per the POH/Service Manual every 7-days and you should be okay. I'd stay away from any Tannis or other type of heating devices as they will create moisture within the engine. You might also consider dehydrator plugs in each spark plug hole and also in the exhaust stacks. And keep an ordinary 75-watt light or one of those recreational vehicle type heat wands in the cockpit, preferably attached to the rudder pedals so your avionics keep dry.
There are probably other things you can do, as per Cessna's recommended procedures in the POH/Service Manual, but whatever you do, DON'T START the engines and run them on the ground, or you WILL end up with moisture accumulation... and then pitting of the cam, etc., which will then necessitate a tear down.
SkyKing
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