I replaced the timing chain on my 617 at 212k....now at 319k with .5 degrees of stretch on the chain.....in over 100k! Proper (synthetic) oil changes I believe to be the reason for the nearly non-existent stretch. Cam and cam sprocket still in great shape, still very little wear on the slide rail/guides. The engine is easily going to outlast the car as its slowly rusting to death after 31 years in a salt climate. When the car dies I will part it out and turn the engine into a generator for my house. 
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-diesel is not just a fuel, its a way of life- 
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
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'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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