ATLD

You said isn't it sad that the guys at the dealership all know you by name?
That is not as sad as having all the guys (and ladies) know you by name at the local Emergency Room. Take it from me, not nearly as sad.
Yes, I changed both timing chains on my pair if MB diesels last month. One had 349,500 and the chain could be heard when revving, the other had 212,00 and the chain could be heard loudly on start up. All it took was to be told that a broke timing chain could total the engine and had them out by that weekend.
Yes, it did resolve the noises and now the higher mileage car runs great. Not that much change to the other, but less racket .
Now, to do something about those ER visits...