The 6M series introduced for the year 2025 moved even more firmly into the large category. Instead of the previous two, the lineup included four power classes of models equipped with a "large frame." These also weighed a ton more than their predecessors. The models 230 and 250, equipped with an "extra-large frame," were unprecedented in the 6M series. The differences between these models and the corresponding 6R models were very small. The three largest models shared the feature of having PSS engines equipped with both variable geometry and fixed geometry turbos, and they were only available with a continuously variable transmission. The three largest came standard with a stepless AutoPowr transmission. When equipped with a mechanical transmission, there were 20+20 gears. At their most advanced, with robotized range shifts, the transmission was the CommandQuad Plus version.

The controls were simpler than those in the 6R series, and the cab frame was different. The instrument cluster was located on the A-pillar. Optional extras for the 6M included, among others, a control armrest, a 10.1″ or 12.8″ display, automatic steering, section control, mechanical cab suspension, hydropneumatic front suspension, and a trailer brake valve. The two largest models featured a 100% front axle lock, and from model 180 upwards, it was available as an option. At the rear, up to four hydraulic sections could be installed.

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