I think it is a very expensive engine and car to maintain with it's rare engine and air suspension-much more than the value of the car. A member on the MBCA forum/featured in the STAR magazine installed a 5.6 in his and converted the air suspension to a modern system.

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Tony H
W111 280SE 3.5 Coupe
Manual transmission

Past cars:
Porsche 914 2.0
'64 Jaguar XKE Roadster
'57 Oval Window VW
'71 Toyota Hilux Pickup Truck-Dad bought new
'73 Toyota Celica GT