From the late 1930s to the 1980s, terms from the German Navy (Kapitän, Admiral, Kadett) and from other official sectors (Diplomat, Senator) were often used as model names. Since the late 1980s, the model names of Opel passenger cars end with an a. As Opels were no longer being sold in Great Britain, no need remained to have separate model names for essentially identical Vauxhall and Opel cars (although some exceptions were made to suit the British market). The last series to be renamed across the two companies was the Opel Kadett, being the only Opel to take the name of its Vauxhall counterpart, as Opel Astra. Although only two generations of Astra were built prior to the 1991 model, the new car was referred to across Europe as the Astra F, referring to its Kadett lineage. Until 1993, the Opel Corsa was known as the Vauxhall Nova in Great Britain, as Vauxhall had initially felt that Corsa sounded too much like "coarse", and would not catch on.
The extra-light, all-aluminium engines, together with optimization of the front and rear axles, also contribute to the low total weight. The particularly compact three-cylinder petrol engines weigh around 15kg less than the previous generation of similarly powerful four-cylinder units. Highly unusual in the small-car-sector is the new Corsa’s aluminium engine bonnet, which although longer, saves 2.4kg in comparison to the previous model’s bonnet made of steel. The Insignia flagship was previously the only model in the Opel range with an aluminium bonnet. The seats also have been put on a diet. The new optimized seat structure saves a total of 10kg – 5.5kg at the front, 4.5kg at the rear. New lighter insulating material was used for fine tuning. Altogether the measures result in a weight reduction that, in combination with optimum aerodynamics and the efficient powertrains, will lead to a considerable reduction in fuel consumption and CO2 emissions.
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.