The Kadett C formed the basis o the Breetish Vauxhall Chevette, which haed a restyled front end an launcht wi a hatchback body, in addition tae uisin a 1256 cc OHV (ower-heid valve) Vauxhall ingine rather than the 1196 cc OHV Opel ingine. The Chevette made the Kadett C notable bi allouin it tae acome Opel's first hatchback — a version named Kadett City appeared in August 1975, based on the Chevette's hatchback body. The Kadett's coupé body style wis niver manufactured as a Chevette housomeivver. Awtho Kadett C production endit in 1979, the Chevette wis produced till Januar 1984. Unuisually for Vauxhall models, the Chevette wis importit tae Germany startin in 1979 tae satisfee the needs o the rear wheel drive traditionalists an wis quite a success for a year or twa. This import version, housomeivver wis niver offeecially badged as an Opel or a Vauxhall - bein named simply as 'Chevette'.
Alfred P. Sloan, Jr., and Charles Erwin Wilson ("Engine Charlie" Wilson), GM's president, were considering the options. Later in April, Sloan sought to resolve the differences of opinion with a position paper that he hoped would set up conditions for resuming control of Opel that would put at rest the doubts of GM's more conservative financial minds.
In March 2017, Groupe PSA agreed to buy Opel, its British sister brand Vauxhall and their European auto lending business from General Motors for US$2.2 billion. In return, General Motors will pay PSA US$3.2 billion for future European pension obligations and keep managing US$9.8 billion worth of plans for existing retirees. Furthermore, GM is responsible for paying about US$400 million annually for 15 years to fund the existing Great Britain and Germany pension plans.
Opel's relationship to GM in America during the war has been disputed. Alfred P. Sloan's memoir indicates that when the war started, as Germany nationalised many foreign-owned industrial assets, GM's contact with Opel was broken and remained that way for the rest of the war. Other writers have alleged that even after June 1940, official connections between Opel and America were not broken, and monetary gain by Americans continued throughout the war.
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).