Simultaneously with the 280 S, 280 SE and 280 SL was presented in January 1968 also in the middle class a "New Generation". The original lineup of the internal W 114/115 series mentioned included six types, the 200 D with 55-hp four-cylinder diesel engine to 250 with 130 hp six-cylinder petrol engine. The top model, the Type 250, was already visibly distinct from its more mundane brethren, he decreed but the only through a double front bumper.
The four-cylinder 200 D to 220 were summarized in the W 115, while the two six-cylinder models 230 and 250 the series designation was assigned W 114th Popularly the models of the "New Generation" are designated according to their appearance in 1968 still regarded as "Stroke Eight types".
The most striking detail of the design of the new models was the so-called "diagonal swing axle". For the first time possessed a Mercedes-Benz production car now has a trailing arm rear axle. Careful development work has given an over previous models significantly improved driveability, without compromising on ride comfort.
In November 1968, the type of program "New Generation" 250 C and 250 CE was rounded up by the Coupé models. The presentation of the two types bedeutetet also a premiere: For the first time a coupé version was now available as an exclusive variant in the intermediate range.
In April 1972, the types supplemented 280 and 280 E model range of sedans. Both were equipped with a newly designed 2.8-liter DOHC six-cylinder engine, the 185 bhp in the carburetor version 160 hp and fitted as an injection. Of the less powerful versions of the new top models in the series could be distinguished even without nameplate; in addition to the double front bumper used in the Type 250 had the only series saloons an up to the wheel cut-reaching rear bumper and two exhaust tailpipes.
Since the appearance of the 280 and 280 E of the type 250 was no longer supplied with the since then 2.5-liter engine, but with a 2.8-liter unit that was known of the type 280 S, but now in a slightly derated version 130 PS was used. The export version of the 250 for the US and Canada was equipped with this engine since July 1970th