Take this with a large grain of salt. After my pump replacements I did a flush and replaced with Prestone LowTox propylene glycol (green). After several months of hard, continuous use, it is still emerald green. Check with me in in about a year. FWIW - I'm not fluid expert, but I do have a bachelors degree in chemistry. I was never able to find anything published suggesting anything special about the difficult to find, expensive Century boiler fluid.
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Bob in College Station, TX
2015 Entegra Cornerstone 45K
2012 Jeep Rubicon, 1994 FXLR
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