With just one month before the 2015 North American International Auto Show, BMW reveals the 2015 refresh for the 6-Series. The updates done by the German automaker and can only be seen from the outside and on the inside.

Exterior-wise the signature kidney grill gets a new design while the front and rear aprons get a new look as well, emphasizing the car's width. For models equipped with the inline-six engines, larger tailpipe embellishers can be found at the back. The 2015 6-Series range now gets Adaptive LED headlights along with BMW Selective Beam and Anti-Dazzle High Beam assist as standard.

The rear design of the BMW 6-Series

New metallic color palettes like Jatoba Metallic, Cashmere Silver Metallic, Glacier Silver Metallic, Mediterranean Blue Metallic and Melbourne Red Metallic added more paint finishes for the 2015 BMW 6-Series. A set of 17-inch wheels come standard on the six-cylinder models while the V8 models get the 18-inch wheels. The bigger 20-inch set is available as an option.

Inside, BMW only added minor details like two-tone leather upholstery and their latest heads-up display technology.

The interior of the 2015 BMW 6-Series

The engines are carried over prior to the facelift, with the 640i's 3.0-liter twin-turbo inline-six producing 320 PS with 450 Nm of torque while the 650i's 4.4-liter twin-turbo V8 generates 450 PS with 650 Nm of torque. Those that prefer a diesel can get the 640d which is equipped with a 3.0-liter turbocharged inline-six that cranks out 313 PS with 630 Nm of torque. The top of the range M6 also gets the carried over engine which is a 4.4-liter twin-turbo V8 that lets out 560 PS and 680 Nm of torque.

The engine of the 2015 BMW M6

All models are equipped with BMW's 8-speed automatic gearbox with Steptronic while the M6 can be had in either a 7-speed DCT or a 6-speed manual.