[leo]

This is a very interesting topic. Lets go back 85 years. Model A's are being run in the winter with methanol (alcohol), the coolant system was unpressurized and radiator caps were vented and not sealed so the alcohol evaporated and had to be added regularly. Surprisingly, methanol increases corrosion of metals. Now we have ethylene glycol which may oxidize to form acids which are also corrosive. We also have propylene glycol which while less toxic than ethylene glycol may also be corrosive. The only product that does not cause corrosion is glycerol which was used before ethylene glycol for antifreeze, however it does have a weaker freeze point and is more expensive than ethylene glycol. Are there any glycerol only antifreezes? Does not appear to be, at best I've found ethylene/glycerol mixes. How about you?