The third generation of BMW 6 Series, known as the F12, was introduced for the 2011 model year. The third generation of 6 Series was available in three body styles: a convertible (F12), a coupe (F13), and a four door Gran Coupe (F06). The F12 was available with a variety of inline 6 and V8 engines, either in single, or twin turbo configuration. A diesel variant was also available. Variants include the 640i, 640d, 650i, and the range topping M6. In 2018, BMW changed their model structure, making the 6 Series grand tourers the 8 Series, and making the 6 Series a range of four door Gran Coupes unavailable in the North American market.