Without a pump, it doesnt mix as fast as it would with a pump. You may have a spot where the freeze level "could" be lower than the rest of it, and that part "could" freeze and cause damage. I personally only have 2 tractors with thermosyphon systems. I did premix one, its a Cub, and doesnt hold much to start with, but I didnt premix my 14, just dumped a gallon of AF, then a gallon of water, and so on, and I havent had problems with either, but I live in the south so it doesnt get cold enough most of the time to do any damage. My buddy up north, he has/had a F30 that has a busted lower casting because he didnt premix, but I think he just didnt have enough AF in there to start with.
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