Hi Guys...

I got the car back about a week ago. The problem is fixed! No more knocking at any startups. They replaced all the crankshaft bearings and timing chain tensioner (one time use). Everything seems fine (been driving it for a week now). I will report back if anything goes weird, but it seems rock solid. I did notice a MB tech doc on my SA's desk outlining this procedure. Its a problem MB definitely knows about and has put together a packet for dealers on how to fix it! My particular dealer had the car about 2 weeks.

Good luck to any others pursuing this fix. It, like others have said, should be fixed without having to jump through hoops with your dealer like I did.

Regards

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93 300D 2.5 Turbo, Black/Palomino 273K
09 E350 Black/Black 41K