Thanks for the advice. Unfortunately, my plans all got shot to bits when I hit a pothole on I-90 about 40 miles from Boston. It destroyed my left front tire, and it took half a day to get my car on a tow truck and then towed to Herb Chambers. I left NY at 10 am, was at the dealership by 630 pm!! Got there after the service center closed, so had to wait till Sunday morning to get a new tire.
Boston's a great city, but man oh man did I miss the hours that BMW dealers have here in NY.