I changed my SD's chain two weeks ago. The odo shows 287,000 miles and had not worked during the 6 years I'v owned the car. I'm guessing it has somewhere in the 350,000 range with the original chain. If the chain had ever been changed it wasn't recorded.

I dunno, perhaps I overreacted when I changed the chain, tensioner, tensioner guide and slide rail. It might have made it to 500,000. I just didn't want to find out so I spent the 200 bucks.

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84 300SD
85 380SE
83 528e
95 318ic