I’d go to the stealership if resale value is a concern for you. Any services done outside of their Vaunted Castle Walls will get heavily penalized on resale.

Having said that, if resale isn’t a concern the stealership often isn’t the best choice. It’s a sort of “guaranteed B” type outcome. They will not mess shit up and they will do it by the books. But a good Indy shop is better.

Depending on your definition of “local” Luxury Auto Barn in Maine is a great choice. The owner is a 20 year BMW master mechanic who went out on his own. The prices are slightly above what you’d find at a dealer but often the overall bill is less (dealer will sit down with a book that says, “if X light replace y part. If that doesn’t fix X light then z part”. A good Indy will look at the problem in toto and say “X light might be z part” and save you the price of y part)

Also, try RB Auto Imports Services in Alton Bay, NH. Roger was a mechanic for, amongst other things, the Mercedes F1 team. The upside is there is no one better, the downside is he can be quite slow (good, cheap, fast…pick 2)