I think they are all based on isopropanol. Methanol attacks aluminium and is probably too volatile; the next one is ethanol which will be abused by people drinking it, so isopropanol is the best option. The higher alcohols, butanol onwards are too involatile and will not evaporate (and smell horrible). You need a certain strength of alcohol to prevent freezing and stop bacterial growth.
How much are you diluting your fluid and what part of the country are you Clan?
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