The emergence of the new Deutz series began gradually in 1958. Already the previous year, a model conforming to the new series, the F 2 L 612/6, was introduced to the market, which was renamed the D 25. The new models featured new 712-series engines, with a cylinder bore of 95 mm. A technical innovation was the suspended front axle. The 1958 models had yellow decorative paint on the engine hood in the old Deutz style. Later models had a chrome strip on the front instead.

The smallest model of the lineup, the D 15, was introduced in 1959. It was only a light update of the preceding F 1 L 712 model and differed in many ways from the larger models. A differential lock was standard also on this model. In 1962, production of the D 15 was moved to the Fahr factory.

In 1960, the D 25.2 was introduced, replacing the D 25 S. New features included a longer wheelbase, an 8+2 gearbox, and an engine power increase of 2 hp. At the same time, the D 30 and D 30 S models were introduced, featuring a 28-horsepower engine and, as a novelty, the Transfermatic power transfer system. The S model also had a dual clutch. Starting from 1964, the series switched to 812-series engines while maintaining the same power ratings.

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