This guy is telling the truth about Lorenzen Motors. I wanted to get on here to get his name out there but I see that someone beat me to it. I just had service done to my car by him. I found him by searching the internet for Mercedes shops.
When i got there, pre-buy inspection was going to cost me $80. Now, I'm a helicopter mechanic so i am thorough when it comes to maintenance. He noticed every little thing about the car (good and bad). he used calipers to measure each rotor, tools to measure the freezing point of the coolant and even used a torque wrench to put my wheels back on (that's my biggest pet-peave.) His tools are modern and complete. And even after 28 years of doing this, He still uses the Mercedes manual (WIS) to do the inspection and make sure he's not missing anything.
When he was done, He only charged me $60 cause he said it didn't take him as long as he thought it would. This guy is honest and really enjoys and, takes pride in his work.
Long story short, He's knowledgeable, honest, by the book, and his prices are reasonable.
Take your car to this guy!