Some european shops here locally wont work on my diesel ,I think its because theyll get their hands dirty.I rely on myself for 90% of stuff needed and my friendly mechanic who sometimes works out of his truck makes a big differences in big jobs..Ive had good and bad out of stealerships in Houston ,Ive been at the dealership you speak of ,try the one off 45 north ,they seem more friendly.In parts price wise it seems like theyre prices change from shop to shop , price around town or order thru PP WOULD BE YOUR BEST BET.