** NEDC: Datele referitoare la consumul de carburant și emisiile de CO2 sunt determinate utilizând Procedura de testare a autovehiculelor ușoare armonizată la nivel mondial (WLTP), valorile relevante fiind exprimate apoi conform cu NEDC pentru a permite compararea, conform regulamentelor R (CE) nr. 715/2007, R (UE) nr. 2017/1153 și R (UE) nr. 2017/1151.

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.

The GSi's engine mapping had been carried out by Opel tuning specialists Irmscher. A model with the 82 PS (60 kW) 1.4 L multi point fuel injected engine, which was otherwise mechanically identical to the GSi, also became available as the Nova SRi in the United Kingdom. In January 1988, a turbocharged version of the Isuzu diesel engine was introduced, with power increased to 67 PS (49 kW).[8]