Mercedes Benz S Class cars depreciate in a shocking manner. My business partner recently picked up a loaded 2010 S550 4Matic with 40,000 km in it for $65,000 including factory warranty. That car cost $140,000 new, meaning more than 50% in three years.
That's depreciation. Oh and the car sucks, his W126 was a way better car. The interior of the new one pales in comparison.