Very true, and I dont think they will happily give out their recipie, so it all comes back to pulling down a motor after long term use, then you will have soild proof or lack of proof to support that Roil contains/does not contain harmfull chemicals.
Personally I am not going to be telling my mechanic, and hopefully other SAU members who know I use it and got to the same mechanic wont blert it out, but I think if I told him he would have the same kneejerk reaction that most people do, and just could not be bothered trying to explain it to him, as being a mechanic he'll use his expert knowledge and experiance to refute the claims made. Well I am just guessing that will be his reaction, but then again I really dont know him that well so he could possibly have the opposite reaction, but meh, I just couldnt be bothered trying to do the whole explanation, sounds too much like a sales pitch when I do try to explain it to people, and I hate trying to sell stuff to other people!