Here's my view on ALL S-class, and it especially applies to AMGs:

If you can't afford to buy a new one, you can't afford to own a used one either.

The S-class is Mercedes' technology leader and is not particularly refrigerator reliable as a result. Just add to this if an AMG.

This explains the steep depreciation, i.e. it's a toy and folks quickly lose interest. PLUS the service costs will be sky high.

Service anywhere but a Mercedes dealer is a crapshoot, too. That is, unless you can find an independent that has recently gone into business having just left a Mercedes dealership with all the latest training.

You've been warned.

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