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I have seen a om617 waggon with 600k miles on the original timing chain. Yes, most likely it was stretched but the car ran fine, untill it broke. If you do religious oil changes you should NOT have to change that t. chain, well unless it stretches over specs. This comes from an old M.B mechanic. The part that fails before the t.chain on a om617 is the vaccum pump. I don't know much abt latter models...
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