Quote:
Originally Posted by iwrock
Something worth noting is that 2009/2010 and newer OM642s seem to suffer from timing chain issues (chain rattle then failure). I haven't been able to verify this, but an MB tech told me the bearing and chain tensioner setup on the earlier 642 are more durable than the later 642... So you may be onto something with the manufacturing process changing at some point necessitating 229.52 oils.
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I was pre-pruchase inspecting a 2012 GL350 with about 90,000 turns and RAN away from it because of the timing chain. I could hear it slap like crazy on startup, and I stethoscoped it while it was running and it sounded like it was about to come apart. GRRRR.
My 07 is at 140K and tight as a dumb.