This is great, thank you. I will be measuring the chain stretch on my 240 soon. She coughs a little at start up and puffs a little white smoke. All the plugs are new, the fuel is fresh, compression is fair across the board and the fuel system appears to be secure. This leads me to think the chain is probably stretched out. As far as I know it is original, so I will probably replace along with some of the other hardware. This will be helpful.

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'95 E300D ("Tank") - 231,000 miles
'79 240D ("Biscuit") - 197,250 miles (Sold)
'83 240D ("Ding-Ding") - 217,000 miles (Death by deer)
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"Back off, man. I’m a scientist” ~ Peter Venkman