Typical mercedes failure. If you wait a day or so the noise or whatever tends to permanently dissapear. 'First few times really suprised me now only glad I did not have the time available to troubleshoot at the time of the problems.

First time was the charm. Heavy dull thumping towards the rear of the engine. Not good at any time and especially as these engines do not seem to drop carbon chunks. No longer there next morning. Never came back. now I wonder if most the items I repaired would have self rectified if left alone? I believe the slogan built like no other car.

I presently have a transmission that seems to downshift into first a little easier than I like on my 1984 300d. Wait for it to rectify itself or go at it? Almost a flip of the coin. Car was not driven for years until reciently.