In December 1984, appeared in the medium range a new model generation that took over from the produced nine years range 123rd The overall technical concept of the series 124 had close parallels to the compact class; by using high-strength steel sheets and other weight-reducing materials and aerodynamic optimization of the body had been achieved in the medium range, a significant reduction in fuel consumption.
At the same time reached with the S-Class and the compact class safety standards, despite lightweight further optimized. The passenger compartment of the 124 series was characterized by high side and rollover resistance and equipped with sophisticated deformation zones in the front and in the rear. The criteria of the frontal impact with 40% coverage and 55km / hr was now fulfilled by the limousines of the medium range. In addition, they had the range of possible contact zones designed to protect pedestrians and cyclists stoßnachgiebig.
With regard to the stylistic design also passed numerous similarities with the compact class. That being said, the new series but also presented with unique design elements that were used for the first time and true to the maxim "form follows function" had factual and functional backgrounds. The characteristic shape of the tapered back and to the side top edges extremely rounded vehicle rear end was aerodynamically very low and declined to wind tunnel testing. Two other typical design features - the trapezoidal pulled far down the trunk lid and the inclined inner edges of the almost square-shaped taillights - enabled a particularly low-lying load sill which facilitated the loading of bulky luggage compartment.
A remarkable innovative design details presented the eccentric-sweep windshield wiper, which allowed the time of his world's largest swept area of a car with 86% gewischter perusal. By the rotational movement superimposed lift movement were the top corners of the windscreen could be wiped much more efficiently than with a conventional single-arm. Electrically heated windscreen washer nozzles included with all models of the series standard.