I have a good independent who used to do my W210, but I am not so sure about AMG for servicing. Certainly, when I called the dealership service centre, they said "AMG and Mercedes are all the same parts anyway, there's nothing special about them" and told me I could book it in for the next available slot in 3 weeks time. Basically, he sounded like a bit of a p***k, so I am not sure where to get it serviced, the same centre had my W210 for 4 days in, without even looking at it for a repair, and I just took it and went elsewhere they are so bad.
WOuld it be insane to drive it to Stuttgart's Mercedes World servicing and get it done there as part of a ring trip? Is that crazy? Certainly, it would be a great trip, service the car and do a few laps. Has anyone done this?