World War II brought to Rüsselsheim the only year in the history of Opel – 1945 – in which it produced fewer vehicles since that first Lutzmann-authored Opel was made in 1899. Before the conflict broke out, the Adam Opel AG had established itself as the largest motor vehicle manufacturer in Europe. The combination of Opel know-how with GM resources had produced outstanding results. In spite of stifling red tape, the economic atmosphere in Germany in the 1930s had powerfully fertilised the growth of this and other auto companies, but in the case of Opel, at least, the expansion of this industrial machine clearly was not directed in any way toward military objectives.
*Fuel economy values are determined through CO2 measurement in accordance with the latest ECE R101/SANS 20101 standards, as prescribed by South African government, conducted in a controlled environment and were correct at the time this disclaimer was published, which is subject to change. The specifications are for comparison purposes between the different vehicle models available in the S.A market which are all tested in the same manner, specific driving cycles and controlled environment.
Within Opel the Calibra was a car with potential but sadly much of it was unrealised. Valmet Automotive in Finland, who had a manufacturing facility that build Calibras alongside the German plant, produced two handsome convertible prototypes that never saw production. A Saab coupe based on the Calibra was also rumoured but, again, never saw the light of day.

^ Jump up to: a b c Note: The powertrain plant Opel Wien GmbH in Aspern/Vienna (Austria) is not a subsidiary of Adam Opel AG but a first-tier subsidiary of General Motors Europe Limited (GME) (99.5%) and of GM AUTOMOTIVE UK (GMAUK) (0.5%), see "Opel Wien GmbH, FN 110500a". FirmenABC Marketing GmbH. Retrieved 3 April 2017. Both, GME and GMAUK, are located in Luton. GME Ltd. itself is a daughter company of GM CME Holdings CV, which is directly controlled by the General Motors Corporation (GMC), see "Name: GENERAL MOTORS EUROPE LIMITED, Company Number: 07556915". Company search, Made Simple Group Ltd. Retrieved 3 April 2017.
Typically, although a far better car, like the Chevette all Kadett models have been the butt of jokes in Europe, particularly for being very common (the quintessential middle-class car in Germany and the Netherlands), very prone to rust and very easy to steal. While essentially good cars, and always praised as such by contemporary press, these gave Opel its commoner reputation it is still struggling to shake off.

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.

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