deanyel said: Chain life varies so much on MB motors there is no rule of thumb, or factory recommendation, on changing the timing chain.
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I should have said that the rule of thumb of 10 years or 100K miles applies to the 420/560 series of engines. At least that is what has always been conventional wisdom on this board in the years that I have been a member. And as I mentioned in my original post, the problem usually occurs not from a timing chain breaking but the plastic guides failing and dropping into the chain mechanism causing the engine to jump time.

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1986 560 SEL (159K miles)