The chain guides are typically what breaks in these motor, which causes interference, etc....
As long as the guides are good, you will be OK. My indy mechanic saw a 560SEL with 400k on it with the original chain, just new guides every 125k miles.
He also said he has never seen the chain just break, there has always been some other failure, leading to the chain snapping.
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-Justin
91 560 SEC AMG - other dogs dd
01 Honda S2000 - dogs dd
07 MB ML320 CDI - dd
16 Lexus IS250 - wifes dd
it's automatic.
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