Allgaier did quite well as a new tractor brand. However, further growth was sought by purchasing the manufacturing rights for the "people's tractor" developed by Ferdinand Porsche. The AP 17, which came onto the market in 1950, was remarkably affordable considering its features, but it did not achieve the great popularity that was originally anticipated. The AP 17 was equipped with an air-cooled, two-cylinder, two-valve diesel engine producing 18 hp. The tractor was notably light for its power – it weighed only 950 kg. For example, the crankcase, gearbox housing, and rear axle were made from light metal casting. One of the biggest special features was the oil clutch. A differential lock was standard equipment.

There were some teething problems with this model, which had been designed from a clean slate, and at the end of 1951, the Typ 2 was introduced, with improvements to the steering, power take-off, and hydraulics, among other things. Vakola had quite a few criticisms even of this version.

In autumn 1952, a more powerful AP 22 was introduced, which mainly differed from the AP 17 by having an increased cylinder bore and a reinforced two-action lifting device. Allgaier’s earlier small tractor, the A 16, got its successor when the AP 16 was introduced in 1954; compared to the AP 17, it had 2 hp less power, a simpler front axle, and the turbine clutch was removed from the equipment.

At the beginning of 1956, the brand name changed to Porsche-Diesel. The AP 16 was replaced at this stage by the AP 18.

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