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MB hasn't issued a replacement mileage on any engine.
They do suggest inspecting the chain any time the valve cover(s) is off.
On a diesel engine 3-4 deg stretch is max & on a gas engine 5-6 deg.
On that engine you would check for stretch at 45deg BTDC compression stroke.
Have seen M119 engines with broken chains at 125K & others with good chains at 200K.
Guess that depends on oil change frequency...?
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