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No, MB doesn't come out and give a mileage that the chain is replaced at, simple as that. "No maintenance interval" is the proper way to state this. Kinda like, oh I don't know, how about the steering wheel? Leave it alllooone.
BUT of course your smart by concerning yourself with it. Sure, they can break, very very rare, especially on the engine in your particular car. BIG problem is that it's rarely the chains "fault". There are guide rails inside the engine that can break, and if they do they can take the chain with it. It's relatively easy to replace the chain itself, but the rails need alot of front-engine disa$$embly. So, what to do? Listen for what is referred to as "the death rattle". This is a rattling noise on first engine start (of the day), lasts for maybe 1 to 5 seconds. Usually this will ONLY require a new chain tensioner (easy easy job). And get it done quick, as this is REALLY bad for the rails, which can drag you down the slippery slope to broken rails, busted chain, timing gears, etc. If you are really really concerned, get the chain checked for stretch, requires the valve cover to be removed, the timing mark for the cams locked in place with a special tool, and record where the timing mark for the crankshaft is, nominal is that the crank indicator is at TDC.
Gilly
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