Yes I believe that it is bolt stretch. I was told to measure the bolts to see that they are not overlength and reuse them.
I noticed that you have a manual transmission 300E. How do you like it? I'm a manual transmission fanatic and will never part with mine. It took me a long time to find it.
Thanks for the reply,
'01 C Class, Six Speed
'84 Euro 240D, manual, 533K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in