In 2003, after a 14 years gap, the 6 Series from BMW returned to grab the attention for the long-awaited GT offer from the Munich based car manufacturer. But that wasn't all. In 2007, the BMW introduced a mid-life cycle improvement model for the 6-Series. There were some modifications both on the inside and the outside of the vehicle and, most important under the hood. It needs a specialist designer to notice the differences between the 2003 and the 2008 model of the BMW 6-Series from the outside. The bumpers were different, with a deeper air-dam in the front and redesigned rear fog-lights. The headlights were changed but in such a way that it was very hard to tell. The rear lights though were switched to LED-type and the third stop-light was relocated from the rear window to the trunk-lid. Inside, there were few minor changes for the climate control unit and an updated iDrive unit. On top of that, there were some buttons to change the gears but, somehow, the BMW engineers considered that it was OK to install both +/- buttons on each side of the steering wheel. There were two completely new engines: a 3.0 liters turbodiesel unit for the European market which was badged as a 635d and another 3.0-liter gasoline engine for the 630i. The V8 was already replaced in 2006 and improved from a 4.4-liter to a 4.8-liter. The top-of-the-range was the mighty M6 with the biggest engine ever installed on the 6-Series: a 5.0-liter V10 naturally aspirated masterpiece.