The chains on the 500/560 aren't much of a problem, as they are the double type. The single roller type on the 420/380 is the one that goes fast.

My mechanic recommends checking the stretch every 30,000 miles, with replacement when stretch is 8 degrees at the crank.

I would check yours sometime soon, just in case. If the oil have been changed frequently, and the PO used good oil, you shouldn't have a problem. Get a new chain rolled in if there is significant stretch. Cheap insurance!

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!