One bit of advice, if someone does have to replace the timing chain and rails on any Mercedes engine, only use factory parts. No aftermarket parts will do here. If one of these 'cost saving parts' fails, it will cost 5 thousand to repair. I have heard horror stories about aftermarket tensioners, and I have seen the aftermarket rails break in less than 20K miles!!!!
The v8's did break chains often, the 6's, all of them, were bullet proof...
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