Brakes aside, I can’t really think of much that would be different running costs wise?
And you could probably argue that the value retention would be greater on an AMG long term when buying at this sort of price point, a set of discs by comparison is neither here nor there (and all cars need consumables replaced!)
You generally get a higher level of kit and more options with many equivalent AMGs and by comparison to even later 5.5 E500s, at least a 35% power increase
Without wanting to offend E500 owners, although I can see the attraction of them compared to a six cylinder diesel or petrol version I’ve always felt the reason they didn’t sell many of them was because the 211/212 E55/E63 saloons and estates were such accomplished cars that people with deep pockets bought them instead.
If a well specced/low mileage/attractively priced 500 came about of course it’s worth a look but otherwise you’ve got similar fuel consumption, insurance, servicing and repair prices but with reduced performance and lower residual value.
I guess what I’m saying is that AMGs make such good value purchases when buying used that I’m not so sure a regular 500 makes a lot of sense money wise nowadays such is the price point of a decent ‘63?