My $.02.

I have customers with 150k miles plus with no problems with the timing chain or the rails. The REASON for this is they always do their service. I mean EVERY oil change has been done and the engine was never over heated.

If a customer ever over heats the engine or misses oil changes, the rails will become brittle and the chain and internal parts will be worn.

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Benzmac:
Donnie Drummonds
ASE CERTIFIED MASTER AUTO TECHNICIAN
MERCEDES SPECIALIST 11 YRS