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The double row chain on the M104 engine is very stout and with frequent oil changes can last a very long time. I have seen M104's and M111's (the four cylinder cousin to the M104) with 300,000km's (190K-miles) or more on the original chain without any noise from the chain.
A mechanic can check the chain for stretch by measuring the change in cam timing.
The only Mercedes engines I would change the chain as early as 100K-miles is some of the V-8 models with very long chains with severe direction changes. Also, some of the V-8's (especially the M116) have plastic guides that age badly.
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