The Kadett clearly featurt a muckle mair modren design than the Volkswagen Beetle which then dominatit the mercat for smaw family caurs in Germany an various surroondin kintras. The Kadett affered mair passenger space, massively mair luggage space an a muckle less encumbered view oot. Its watter cooled ingine enabled it tae provide a far mair effective heater. Even fuel consumption wis unner maist conditions superior tae that o the Volkswagen, an mony commentators muckle preferred the Opel's handlin an its licht an effective brakes tae those o the mercat leader.
Production started on December 4, 1946. The Moskvitch 400/420 continued to be made in Moscow with some minor changes until 1956, when it was replaced by the Moskvitch 402. The latter was an all-new design apart from the engine, for which Moskvitch continued to use the Kadett side-valve engine until 1958, when it was replaced with a domestically designed OHV engine.
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).