I don't think you can but methanol antifreeze anymore. I haven't seen any for sale for 30 years or more.
The boiling point of methanol is low enough that it will "distill" itself out of the cooling system and you end up with only water that will freeze or the engine overheats because of low coolant. That's probably why it isn't sold any more.
I've heard of guys putting kerosene or diesel fuel in the cooling system in the winter as an antifreeze.
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