Fortunately, I have enough mechanical knowledge to listen to an explanation and determine if the tech is BS'ing or not. I moved to Atlanta last year and had to find a tech for my business vehicles. The first few times I took vehicles to them, I acted like I didn't know beans about vehicles ("Brake caliper?? Idler pulley, what is that?"). They gave me GREAT advice. It also seems that shops start taking my business for granted after a few jobs, but that hasn't happened with these guys.