I have drained my block , radiator and have run a mixture of antifreeze good to -20 below thru the motor and radiator and drained it but left the drain plugs out . Or should I put some antifreeze in the motor
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A mixture of antifreeze and water should be in the engine, with enough antifreeze to prevent freezing in your extreme low temps.
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The water will slowly evaporate only bringing the freeze point lower, unless you will see temps lower than -20 I wouldn't worry about it.
I drain the water and put in a 50/50 antifreeze mix. I'd just leave it empty but the antifreeze helps to prevent corrosion. Come spring I just drain it and put straight water back in. We'll see temps here well below zero from time to time....
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Definitely put antifreeze in it. I would also add to get motor good and hot before you park it to help get most of the moisture from inside the motor.
Even if you heat it up good you can get some moisture between skirt and cylinder walls that can leave some corrosion marks on cylinder walls if it sits too long. I would say you should spin over motor once in a while.
Also as it gets cold moisture from the air can condense on cylinder walls and cause light surface corrosion.
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I also use fogging oil in each spark plug hole, makes a difference
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