You may have seen my thread in genmay with my radiator leaking and it looked like corrosion. I have been using distilled water with PTNuke for the past 5 years, but I have been reading that the PTNuke might be causing some of the corrosion. So... what is the common liquid coolant to use nowadays? Reliability and no corrosion is all I really care about. Looks do not matter. Preferably not overly toxic and a pain to dispose of either.