BMW has quietly launched the 6 series coupe in India. This time around there is also a diesel variant available. The twin turbo V8 petrol engine displaces 4.4 litres and this version is called the 650i while the diesel variant called the 640d and is powered by a 3 litre engine churning out 313 PS of power. The petrol variant is priced at Rs. 85 lakhs ex showroom Mumbai and while the diesel is cheaper at Rs. 75 lakhs ex showroom Mumbai. 