Antifreeze is a good thing, but it's wise to premix it in a thermosiphon system, especially on a tractor that doesn't work hard. Once mixed with water, it will stay mixed, but it would take a good bit of thermosiphon circulation to mix it up right if you put it in separately. Better to mix it in jugs before you put it in.
Another advantage to anti-freeze (apart from the annual filling and draining exercises) is the anti-corrosive properties. Before switching over, you might want to consider givin' your tractors a good hot run with washing soda mixed into your water. It would mean draining first, but it might be worth the effort. Mix two pounds of washing soda into three gallons of water. Stir it up well so that the soda dissolves and is suspended in the water. Dump it all into the radiator, top it off with water and give the tractor a good hot run. Maybe even let it cool down in between and give it a couple or three hot runs. Drain it after it cools a little (head still warm but not uncomfortable to touch). You'll get a lot of brown crud out when you drain it, especially on a tractor that's been running water and then left dry in the winter. You'll have cleaner surfaces inside, which can only help the anti-freeze with the cooling part of its job.
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