BMW 6 Series refers to several generations of executive coupés produced by BMW.
The first was the E24, being derived from the E12 & E28 5 Series 4-door sedans. The E24 launched in 1976 to replace the 3.0CS & 3.0CSi (E9). 14 years later, in 2003, BMW released the all new E63/E64 which was available as a coupé and convertible, based on the chassis of the E60 5 Series sedan. Models were the 645ci (later replaced with the 650i) and the 630i. The highest performance 6 series is the BMW M6. The third generation F12 and F13 6 series is scheduled for release in 2011 for the 2012 model year, sharing a platform and some engines with the 7 Series (F01) and 5 Series (F10).