I wanna add another shop to the list,
I've gone to Euro Car Doctors, and I like it.
I have also gone to Motorsports, Ltd. However I have never had anything done there.
The other one is Koko's Garage and Son on Mt. Auburn St. Cambridge, MA..
The guy is definitely a diesel guy. I was looking for something else in Watertown when I came across his shop. It was closed when I saw it. However, I told him that my car shakes a lot. So he looked at it, adjusted the rack damper, replaced the air filter, Diesel Purge'd it, and fixed a rattling air filter. The car ran a lot better. I do not know which one fixed it... I am not going to complain either
In the end I ended up paying just a little more than if I were to buy the air filter and diesel purge by myself. In fact Diesel Purge is cheaper from him than from an online store (not Fastlane...)
so much for online shopping...