These cars were designed and built for 140+ MPH autobahn crusing and they will do it with total confidence all day long.

As JCE pointed out, the most common problem that prevents this from happening is a bad "dogbone" somewhere in the rear suspension. That said, there are LOTS of other things that COULD cause lack of confidence in the handling department such as; bad or low tire, bad shock(s), front end problems including suspension links, steering linkage or steering box.

Granted, the 124 is not an SL, but if everything is correct they are an awesome high speed or winding road cruiser.

Good luck,