At the end of 1967, the Deutz 06 series was introduced as the successor to the 05 series, featuring new FL 912 series direct injection diesel engines. All models now used TW series gearboxes, which had previously been used in the 4005 model. There were 8+2 gears, with an optional 8+4 gearbox for the larger models, where the reverse gear was integrated into the range gearbox. The 8+4 gearbox was also available as a synchronized version for an additional cost. Except for the smallest model, Deutz tractors were equipped with a dual clutch. As an extra feature (standard on the 5506 in Finland), there was a power take-off (PTO) clutch operated by a hand lever.

The design had changed to a more angular style, in line with the fashion of the time. The model range was more unified than before, meaning that the same parts were used as much as possible across different models. The hydraulics in all models were produced by Bosch and ZF. Models 4006 to 5506 were also available as four-wheel drive, equipped with a Sige 3500 front axle. The front axle of the two-wheel drive versions was suspended in the early years. In Finland, the small models were equipped with Tur-La or Terä cabins, later replaced by Kuusla cabins. In 1970, an alternator became standard starting with the 4006 model. From 1972 onwards, models 5006 and 5506 were equipped with dry disc brakes.

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