BMW 6 Series 2015BMW has given the 6 Series Coupe, Convertible and Gran Coupe range a mild facelift for 2015, with blink-and-you’ll-miss-it styling tweaks concealing equally mild enhancements below.

Even BMW admits the exterior changes are subtle: the front bumper gets a full-width air intake and there’s a chrome bumper insert for the rear. New colours and wheels feature, while the kidney grilles get nine bars instead of 10 (yes, detail changes in the extreme).

The biggest change is the addition of standard full LED headlights to all models.

Slightly more significant are the interior upgrades. All models now get a leather dashboard with contrast stitching, an improved iDrive display with a more precise controller and standard ConnectedDrive with full concierge functionality. Instruments are also now a fully configurable LCD display.

As for engines, BMW hasn’t bothered to add any more power to the line-up of 640i, 650i, 640d and M6 variants. They are a bit more fuel efficient though, with the diesel boasting CO2 emissions as low as 139g/km. All are now Euro 6 emissions compliant too.

And, as BMW argues, it didn’t really need to add any more power: every single variant can do the 0-62mph benchmark dash in 5.5 seconds or less…

Petrol version will sound better thanks to a new sports exhaust, while all models will handle better courtesy of suspension tweaks.

Following their Detroit debut, the new BMW 6 Series range will go on sale in the UK from 1 March, with prices to be confirmed.

BMW already knows which one will be most popular: of the 80,000 new 6 Series produced since the model was introduced three years ago, around half of them have been Gran Coupe variants – and that’s despite the four-door coupe not arriving until a year after its coupe and convertible siblings…