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The objective was to develop a modem engine to succeed the M 102; 2.6 million of these units were made between 1979 and today making it the most successful Mercedes-Benz four-cylinder petrol engine to date. The new M 111 coordinated production set-up together with the familiar M 104 six-cylinder four-valve engines and the 600 diesel series. Emphasis has been deliberately given to improved torque rather than very high volumetric efficiency. This has made it possible to apply four-valve technology, which was originally only to be found in motor racing, in such a way that ordinary customers can benefit form advantages such as high torque and raised power output, as well as reduced fuel consumption and emissions. Extensive noise-reducing measures in the engine ensure that, despite the higher power output and lower engine weight, noise levels have also been improved.

When Mercedes-Benz enhanced its mid-series in autumn of 1992, the previously installed six-cylinder engine with four-valve technology and 3.0 litres total displacement [1] was replaced by the four-valve engine with 3.2 litres total displacement familiar from the new S-class [2]. For this application, the engine was subjected to still further development in terms of combustion mixture preparation and engine management, and a variant with a total displacement of 2.8 litres was added. This engine replaces the engines of 2.6 total displacement [3]. This further development, and the new engine, are described below.