here I have had problems with oreilleys, (have gotten the right part less than tech wrong one) autozone can't find anything without help, and Napa the people won't even look you in the eye, and still get it wrong. Advance here has a couple of mechanics, a painter, and some guys who race circle track, only time the part has been wrong was when the catalog even had it wrong (helped them double check it) I also know that the shops around here tend to use advance, no one uses autozone