since noone has answered, yet
I'll give it a shot.
If you change oil/filter regularily, the chaintensioner is working properly
and engine is not beeing overheated, the timingchain, you refer to is good
for many, many KM...to give it a number...200KM and more.
If you have concerns, have the chain tension and or chain wear checked.
I drove my 240D for 400.000 KM with one chain....my 190E for 250.000KM with
first chain...I never had a chain brake on me....knock an wood *knock,knock*
...basically, it's all about maintenance...if you take good care of your
car/engine, it will take care of you and last, and last and last.
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