dealer's rate is a lot more than an indy shop... something like $130/hr vs. $80-$90. Big jobs can mean a big difference. Sometimes the benefit is you get a loaner from the dealer. I would only go back to the dealer if it were an uncommon issue. Dealers are also more inclined to try and rip off your warranty company. The latter can tell you all about that.

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'08 X5 3.0si - Alpine White / Saddle Brown interior
Specs: Sport Pkg, Premium Pkg, Tech Pkg, Comfort Access, Aero Kit, Style 433 staggered 20s on Conti DWS
Mods: Carbon 35 tint, LED angel eyes, GP Thunder 7500k fogs, H&R 20mm/25mm spacers, clear reflectors, gunsmoke-tinted taillights
Coded: Digital speedo, windows/sunroof/tailgate close via keyfob

X5 pics at Flickr