There are many kinds of Buick cars, and the platforms used are different. Buick New Century and Buick Regal adopt the long-standing W-drive mid-level car platform (the first generation), while Buick LaCrosse adopts the second generation W platform, which has typical characteristics of American commercial vehicles, but the fuel consumption is extremely high.
With the increasing shortage of energy, consumers have higher and higher requirements for fuel economy and vehicle handling. According to the situation, GM immediately completed the transformation from W platform to Epsilon II. The brand-new Buick Regal, which was launched in early 2009, adopted the Epsilon II mid-level car platform born in Germany and completed the strategic transformation from American models to European models. Some people call this car Opel Insignia, the OEM Buick logo, Opel Insignia in Europe, Horton in Australia and Buick New Regal in China.
Because GM is an American, but the birthplace of Epsilon II mid-level car platform is Germany, it is controversial whether Buick's new Regal is an American car or a German car.
By the way, Buick Excelle is a world car that GM acquired from Daewoo, South Korea, and cooperated with multinational automobile companies around the world: the body design was completed by two Italian design companies, the body structure and chassis development was completed by Daewoo, South Korea, the engine was designed by Opel, Germany, made by Horton, Australia, and the gearbox was designed and manufactured by Japanese companies, and finally assembled in South Korea.