Need to find a MB repair shop in Maryland
If you do need a different location, I would suggest you go to the tirerack website, enter a zipcode and check out their list of preferred installers and then call them - thats how I found the place I use to begin with...maybe what you are really looking for is a reliable gas station/repair center - I understand they can be cheaper but I dont mind paying for specialized experience.
I cant answer you questions about buying parts before you take the car somewhere - that doesnt seem to make a lot of sense to me. How would you know other than say an oil filter, what is really needed? Call places and ask them what they charge for parts and labor for a complete 50k mile B-Service for your car and that will give you a sense of what you are in for.
I heard Mitch Carr in Kensington is also pretty good.
To find out what has been done under warranty, you can call the dealer and get a print out. (Vehicle Master Inquiry)
Thanks guys for your input.



