I found that Hatch and Sons in Wayland, MA did excellent work on both of my W210 diesels. They also seemed to have a great selection of used MB's (And Ferraris), although I have not purchased a car there.

I am happy with their service and would highly reccomend them to anyone in New England. (I drive 85 miles to get them.)

www.hatchandsons.com

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currently enjoying,
'96 E300 black opal 149K
'97 E300 smoke silver 137K
also owned by family members,
'83 240D manual
'97 E300 white
'02 Jetta TDI