BMW 635d Sport

Five years after the engine’s launch, BMW has finally slotted its superb twin-turbo 3.0-litre diesel into the 6-Series coupé, creating the world’s first oil-burning luxury Grand Tourer.

BMW 635d Sport

Sport variant holds road particularly well. Integrated spoiler has been added to bootlid

Shifter is new

Cabin is beautifully built, but could do with more stowage space

Impressive diesel now offered in 6-Series

BMW 635d Sport boot

Rival: Mercedes CLS320 CDI
While it’s not strictly a two-door coupé, Mercedes’ ultra-stylish CLS is also available with a strong diesel. The 224bhp 3.0-litre V6 isn’t as powerful, clean (200g/km) or efficient (37.2mpg) as the BMW, but it is significantly cheaper, costing £43,957.

BMW 6-Series 635d GTs

Price: £50,895 - £82,685

The 635d has a straight-six twin-turbo 3.0-litre turbodiesel that’s hard to fault. It offers even more torque than the V10 M6, and there’s no arguing with 0-60mph in a mighty 5.7 seconds.

BMW 6-Series 635d GTs

BMW 6-Series 635d

BMW 635d GTs passenger compartment

BMW 635d

On the road, it feels extremely fast, especially in kickdown. However, it’s the effortless nature with which it gains speed that really impresses, while the engine remains unruffled even when pushed hard. Through corners, the BMW continues to impress. There’s lots of grip, the steering has good feedback and it remains composed. However, this involvement does lead to a firm ride and a surprising amount of road noise. It’s not comfortable enough to be a true GT.