Recommend a reputable shop in San Diego for G550?
Parking around his shop is always a little tricky so be prepared for that, worst case you can probably just pull up in front of the entrance, and if you call and make an appointment noting that you need a loner, he normally can get you one, which I think is a huge perk to most independent service places.
I think he also gives free diagnostics.
http://www.exclusivemotorsmercedes.com/





