Please don't take this the wrong way but I just don't understand some of the statements that have been made.
First, if AutoRx begins liquifying crud on contact, why does it take so long to clean? I'm not meaning to question it's effectiveness, it's just that sounds kinda paradoxical.
Second, if AutoRx's chemestry is inert, how is it removing/liquifying sludge? It's got to be reactive in some form or fashion with hydrocarbons. Otherwise what is is doing?
Third, with regard to the health and environmental safty of solvents, if they are disposed of properly (as with used engine oil), what are they really hurting? Even some of the so-called harsh solvents like chemtool and seafoam aren't listed as carcinogenic even though used engine oil supposedly is. I don't think there's a serious exposure risk from simply pouring them in your crankcase.
I'm sorry if this came off the wrong way but perhaps it's just that to the layman like myself, some of the statements on this site about AutoRx seem a little perplexing. Not to mention the fact that many times when someone brings up that autorx didn't really clean things up, they are immediately accused of having done the process wrong or told things like "it's not gonna fix a broken engine."
Now, that being said, I am willing to try anything, and just so no one thinks this is just an attack, I must tell you I have autorx in my oil RIGHT NOW! I'm about 500 miles from being done with my first cleaning cycle. So, I am willing to give it a fair try, I just am curious about some of these statements.