BMW is hard at work revamping its future lineup by making some The new premium GT would range from the 620d to 640d – for diesels – and 630i to 640i – petrol, with 640i xDrive the only U.S. model planned initially. Previous reports said the BMW 6-series Convertible The 6-series convertible used in this movie is a bmw 640i that is powered by a 3.0-litre V6 petrol engine producing 315bhp of power and 450Nm of peak torque. This engine comes mated to an 8-speed steptronic automatic transmission. .