The current BMW 6 Series was completely redesigned. An all-new, aluminum-intensive structure based on that of BMW's 5 and 7 Series sedans lends greater structural rigidity and keeps weight down. It keeps it light, but not svelte, as this new 6 Series also grew in size. The biggest changes are to the styling (which is toned down to be less adventurous) and to the engines. The new twin-turbo V8 is now almost as quick as the old V10-powered M6. The 6 Series is available as a coupe and soft-top convertible in a single trim level known as the 650i. The convertible is significant for its clever soft-top roof design, which features a separately controlled rear window. Lower it with the roof up for added ventilation, or raise it with the roof down for use a wind deflector. 4.4L V8 engine Automatic transmission Up to 17 cty/25 hwy mpg Navigation System Bluetooth Side/Curtain Airbags Stability Control Traction Control