MR MB Motors is in Reseda, a few minutes away. Highly, highly recommended by me and a bunch of other people. Enrique has done a PPI for me in the past, didn't charge much, saved me from buying a 300D that would have been problematic, to say the least. Not that I've drunk the Kool-Aid or anything, but I drive my car from Utah for him to work on. And yes, he does know the newer cars quite well, a friend of mine has his W210 E420 maintained there.
MR MB Motors Tarzana, CA