As an old car guy, though it's been a while, I subscribe to the theory of don't mess with it, unless you have already obvious trouble. "Power Flush" to me is a gimmick. Change the hoses, excellent idea, and just put in new anti-freeze, mixed for your locale. Throw the old crap in the back yard. What is this, friggen Green Peace? I have to ask how many "car experts" here really search out anti-freeze disposal nodes. Ever get out of the City? Or vote Republican?