colaska - my in-laws live in Portland and we go to visit them fairly often.
At the beginning of January I went to Esquire Motors on Canyon Road (right across from the new Goose Hollow "Max" station). I had bad glow plugs replaced, injectors tested, idle adjustment, and an inspection for leaks.
I believe one or two of their mechanics are the "diesel specialists" there. I was able to speak to the mechanic directly; in fact he took me in the shop and gave me a tour of the engine compartment, pointing out everything that needed attention. He was great and really knew his stuff. I definitely felt everything was done right. By the way, they are a licensed Bosch service centre.
My wife knew of this place because she had been bringing her 74 Beetle there for years.
Pricewise, it was hard to say - everywhere seems expensive to me nowadays (I think my salary is not keeping up with inflation) and then when I converted the bill to $CDN - yow.
BUT it's a good feeling knowing things were done right. I recommend them.
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92 Passat TD