Service department should just be called "department" because there is no service to be had. They do not call when they say when they're going to call (I experienced this both with my service adviser as well as the service manager - and I'm talking two week lapse from the latter, not a couple of hours). The diagnostics on my mechanical issue was never fully resolved, after I spent several hundred dollars for them to treat a surface issue (replacing all the hoses, claiming the recently installed non-OEM hoses were ill-fitting). Their ultimate recommendation was replacing a $1300 part. It took two different back-to-back visits to the shop and my car being there for 10 days total for them to come up with this. The only reason the service manager DID call me back is because MBZ corporate in New Jersey had to tell him to do so after I spoke with them.