The transfer gearbox in the AWD models — the same as used in the Vauxhall Cavalier AWD—was somewhat on the flimsy side, liable to suffer damage from conditions such as minor differences in tyre wear or tyre pressure between front and rear axles. Since front and rear tyres would naturally wear at different rates in normal driving, it was necessary to swap front with rear tyres every 15,000 miles (24,000 km).
In 1924, the Rüsselsheim-based company went even further to cater to the “average consumer” – also thanks to an automotive innovation. After all, from the very first minute Opel was committed to producing cars as efficiently as possible and thus making them affordable for a broad customer base. Consequently, the 4/12 hp heralded the start of assembly line production in Germany. And because the 60 km/h fast car was only available “in a quiet green that pleases the eye” to keep the time and effort required for production at a minimum, everyone called it the “Tree Frog”. Soon, 25 two-seater “cars for everyone” left the assembly line every day. In the following years an entire vehicle family was built on the Tree Frog technology. The smoother production ran, the greater the cost advantage that Opel passed on to its customers. Unbelievable but true: the purchase price of the 4 hp model series, of which 119,484 units were produced, was almost 40 per cent lower in 1931 than at the launch of the Tree Frog model.
Cars and truck production lines were lost by Opel. As reparations for war destruction, under plans of the Allied Forces, the Soviet Union asked the Allied military government for the tools, jigs, dies, fixtures, and drawings for the Kadett. This, they said, they would use to begin auto production at an Opel subsidiary in Russian-occupied Leipzig. The equipment was duly delivered to the Soviets in June 1946, and that was the last Opel was to see of it – but not of the Kadett.
In Australia, the car was launched to much fanfare from many motor journalists, and went on to win the Wheels 2001 "Car of the Year" (COTY). Holden also imported the SRi version with the 1.8L Astra motor and uprated sports suspension including traction control, ABS brakes, a better tyre/wheel combination and Irmscher body kit to produce a "baby hot hatch" Barina.
More or less by fait accompli, in the absence of the tools to build the Kadett, Opel found itself in the middle-priced bracket in Germany's postwar auto market, sandwiched between Volkswagen and Mercedes-Benz. This position was familiar to both GM and Opel, and one in which it did amazingly well. In 1953, output rose above 100,000 units for the first time since the war, and in 1954, when the sprawling plant by the Main River was considered completely rebuilt, 24,270 were employed at Adam Opel AG and 167,650 vehicles were built, an all-time high. Opel actually fully recovered from the consequences of the postwar era.
While the Ipanema clearly succeeded the Marajó, production of the Chevette (by now in sedan form only, the hatchback having been discontinued after the 1987 model year) and of the Kadett noticeably overlapped; the newer model was placed above the old one in Chevrolet's lineup. While Chevrolet entertained the possibility of a pick-up version of the Kadett E, it never materialized.