IMHO here's the story as regards the S-class: If you can't afford to buy a new one you can't afford to own one ever.

The S-class is Mercedes "leading edge" car and as such requires LOTS of TLC from dealers. Make that expensive TLC.

The E-class, however, is the taxicab of Germany and a lot more practical bet.

Most S-class owners who are past warranty are probably just treating their cars as "run-til-it fails," (i.e. like a Camry) and if an S-class has been in that state for long you don't want it.

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Kent Christensen
Albuquerque
'07 GL320CDI, '10 CL550. '01 Porsche Boxster
Two BMW motorcycles