Re: Evans coolant.
I'm not sure if it applies to what's being sold on the retail market, but I can tell you that water additives in general are necessary thing. I worked a long time for a manufacturer and part of the job was maintaining the cooling tower and high pressure boilers. Both required additives, though each was different.
Tiny bubbles can be entrapped in the liquid and they act like an extremely aggresive sand blast sort of way. They will pit and remove metal up to absolute destruction. In addition, they are tiny pockets of insulation inside the stream and can seriously affect how much the water can reduce heat. The water can't carry away heat if there's an air bubble between it and what you're trying to contact.
Again, I have no idea of what's being sold. But from running, maintaining, and repairing million dollar systems I can vouch that it's a solid concept.
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