Money

Surprisingly, the vast majority of expenditures with a car like this aren't actually gas or insurance. Having now lived with the car for a while, I've got some fuel economy figures and they aren't that terrible. I get 12 litres per 100 highway km's at mixed 80/100kph speeds, and as low as 15-16 l/100km cruising in the city. For this kind of engine/tranny, that's pretty good, no?

Also, insurance costs LESS (about 25% less) than the E 320 Coupe insurance. What a difference 5 years and a popular boyracer chassis (W124) makes.

But you don't want to know about prices of spare parts, or labour...