Date registered: Aug 2014
Vehicle: 2011 E350 Bluetec, 1992 300SD, 1995 E300D
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I must agree with Haliscomex. My wife's 1992 300SD (W-140) developed a few bugs. Intermittent power loss, low battery light when the car sat for 2 or more days, and intermittent lumbar support pump/lines.
The alternator, battery and injector pump were replaced and the lumbar support...well, that was just disconnected. We took the car back the following week for the low battery light and low power. Pretty much the same stuff we brought her in in the first place.
2 alternators and a few weeks pass and the car is ready. We pick her up and leave my 1995 E300D (W-124) for a blower motor for the heat/air and a problem with the alarm going off now and then. 1 new battery, a plain wrap alarm, 1 tank of diesel (it takes an easy 500 miles of driving to do that) 1 exceptionally noisy generic blower and we pick it up and drop of the 140 to be "fixed" yet again plus a new problem. Windshield wipers on the headlights no longer work and they windscreen wipers are out of sync with the washers.
Weeks go by. I call and it will be ready in a couple of days. Wifey checks out the car and she needs to explain how wipers work. She isn't a mechanic, just knows how her Mercedes works. OK, supposed to work. We leave it there voiding our plan to return the 124 to fix the generic alarm. It still went off at random hours and the entire control head and wires were under the removable floor mat. Really? YES.
There is far more that happened to these two cars while under MBZ's care. My only advice is if you have an older diesel is to take it anywhere else. I won't find out if my 2011 E350 Blutec is a diesel they can fix as I believe that MBZ's reputation relies on being better than the other repair shops in the area. Side by side to a good shop in say Texas and it may not seem so hot.
BTW, take your S there and there and watch them slam the door. It won't matter how nicely you ask that they don't.