Another advantage of ethylene glycol coolant is that it raises the boiling point if you have any worries about overheating. I don't know the values for an unpressurized system like the CMP's but Prestone (brand name but often used as a generic name for antifreeze) claims 265 degrees F for a 15psi system (50/50 mix).
Last edited by Grant Bowker; 03-02-18 at 01:59.
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