I am looking to head out on PWS before the end of deer season. The last time i went out this late the bays we anchored in would ice over. Not brutal but still cold enough to seperate salt and water. My new boat has an outboard on it, should i be concerned if the temp drops low that the water passages in my outboard will rupture? All my experience is inboards with heat exchangers and i don't know what level of protection i should expect from an outboard.