If it stays above freezing you wouldn't need to worry about the lower unit cracking, but there is still the question of the gas denaturing(sp) it tends to seperate when it sets for a while. (Enter Sta-Bil)
James, that will work as long as you are sure you can drain ALL the water out of the lower unit thru the hub, and if you do not have a small leak in an exhaust port which allows water to get into the cast aluminum cavity of the lower unit.
If I keep my boat inside around 50 degrees I would still fog the carbs so they would not build up any gas film inside. As far as the lower unit I change the oil in mine every year, it does not cost that much for the oil.
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