Opel Insignia. The Opel Insignia is a car produced by the German carmaker Opel since 2008. its available as a hatchback, saloon or an estate. Like many Opel models, it is sold as a Vauxhall in the United Kingdom.In the North American market it has sold as the Buick Regal since the 2011 model year as a sedan only.pel Insignia. The Opel Insignia is a car produced by the German carmaker Opel since 2008. its available as a hatchback, saloon or an estate. Like many Opel models, it is sold as a Vauxhall in the United Kingdom. In the North American market it has sold as the Buick Regal since the 2011 model year as a sedan only.