In my vintage MGA race car, I am not allowed to run antifreeze because if it gets on track, it is extremely slippery and a danger to other racers. I considered using the Evans waterless coolant, but decided against it for reasons that I no longer remember. I opted to use a product called No-Rosion and have been quite satisfied. They have two versions, one for cast iron engines (redish hue) and one for aluminum/alloy based engines (blueish hue). In terms of rust protection, it is very good - at least after several seasons and system drains for the winter. About the only solids that drain out of my engine now appear to be a few fine sand grains left over from the original casting. Water-Wetter is another alternative.
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