I use 70% distilled water, 30% antifreeze. I tried Wetter Water once with no noticable difference. Of course I'm in Phoenix and not much helps. I eventually had my radiator recored and that made a huge difference. Dan Serrao 1963 BJ7 Fountain Hills, AZ People who don't read the newspaper are uninformed, those who read the newspaper are misinformed........ Mark Twain