I'm not of the opinion that the "M" pump give the engine any more power than the MW found in the USA versions. The only real advantage is the lack of the early non turbo AC controller box found in 78-81 w123's with the 617. The 240D(616)/euro(617) AC are the same and less problematic. It may also have non power windows which some prefer. While many also prefer the smaller euro bumpers for the looks, in the city they provide almost no parking protection against idiots who park by feel. If you get rear ended they do nothing as well.