Lets get this right, the manager had to bring in his own spline socket to use in the shop (not very well equipped, are they?) the only diesel savvy person (mechanic?) was let go (why? too old or no good?) they are taking 6 days to see why the last botched installation of delivery nozzle seals made the engine idle poorly, and now they are going to replace a temp sensor for some unlogical reason (called shotgunning the problem)?!
Please keep us informed of the comedy (I'm sure its not funny to you!)
And yikes the 560 fill ups can be a painful. I drove a 560SEL loaner about 15 years ago, while my 300TD engine was out of the car and it had a bad idle speed control valve, I could almost see the fuel gauge dropping even sitting at a traffic light! But the car sure went fast when I told it to!