So I went to get my first oil change yesterday and upon arriving asked the service guy if they had ever advanced the timing on any Titan's or Armada's. Of course he said no, but seemed opened to my request. He comes back a few minutes later and said his tech didn't give him that "warm/fuzzy" feeling about doing it and that he would have to run it through the service manager, because they were worried about warranty issues. I told him I could pay him cash, no receipt and he hesitated, but insisted on going thru the service mgr. I tried to assure him that there were no warranty "violations", but no luck. To top it off, the kid that was working on my truck (whom I've dealt with before and thought was pretty cool), comes out shaking his head. I believe his words were "man, you can't just go messing around with factory specs". Then, he proceeded to tell me that the timing would only hold at idle and once I accelerated it would retard. Any truth to this?