Good question about the timing chains. I would also to be interested to know, because out of all of the S-Class sedans I have been considering- no one knows when it was last changed.

Would be nice to know of the warning signs of a worn chain/tensioners, before shelling out $1000+ for one if it is not really needed, but too scary to think about not have it changed, snapping and causing thousands in damage.

The 85 S-Class I am considering has 152K- timing chain replacement unknown.

The other "common" issue with the 560's are rear suspension woes.