At the end of 1983, Deutz-Fahr introduced the updated 6-cylinder DX models. Power had been raised slightly compared with the previous versions. Of the units imported into Finland, the DX 6.30 produced 115 hp and the DX 6.50 137 hp. There was also a 100-horsepower DX 6.10 in the line-up. The smaller models received an 18 + 6 gearbox, which meant that the maximum road speed for the 6-cylinder tractors was now 40 km/h as well. The DX 6.50 was fitted with a Powermatic quick-shift transmission previously used on the DX 145; it offered 30 + 10 forward/reverse gears and, with creeper gears engaged, 40 + 10.

On the 1987 models a sixth main gear was added, bringing the total to 48 + 12. The front-drive PTO shaft on the 6-cylinder tractors was also centrally located, and the turning circle diameter was substantially reduced thanks to steering angles of up to 50 degrees. The control layout saw minor revisions and a new seat was fitted, but otherwise the cab remained unchanged and the noise level stayed at 84 dB. The largest model in the range had a lifting capacity of 6 500 kg.

In autumn 1986 the optional equipment list was expanded to include the Agrotronic on-board computer with radar-based speed monitoring (see lower photo). At the same time the entry-level DX 6.05 was introduced. It used the same transmission and Sige front axle as the DX 4.70 and had lower hydraulic output, but otherwise shared the technology of the 6-cylinder series. According to German sources its rated power was 98 hp, although in Finland it was advertised as 102 hp.

For 1988 the cab received a few small improvements: the heating system was upgraded and front working lights were added as standard. Noise levels dropped to 80–82 dB. In the USA the DX 6.30 and DX 6.50 were marketed as the Deutz-Allis 7110 and 7120.

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