I have had E320 CDi's for nearly 4 Years and have found no problems whatever with them.

More performance than the E320 Petrol V6 and lots more MPG.

Reliability of mine is 100% and others that go to the same service center is 100% so I am told.
They have not had a single major failure in the 4 years they have been servicing them.

I also think that this "Low Quality" Diesel is a rumour based on lack of knowledge.
In my travels around Europe I have put in my tank a fairly wide variety of different quality fuel and the only difference observable is the MPG I get.

Think your Dealers are "Afraid of the Unknown".
They and the buyers of the CDi will soon learn that it is the finest Diesel money can buy.

Noise is only an issue for the first Minute on a very cold day.
Then it is hardly noticable unless you have the window down.

Regards

Mike