The BMW E60 automobile platform is the basis for the 2004 5-series of automobiles. It replaced the BMW E39 for 2004. Models available at launch include the 525, 530, and 545. All models received an engine upgrade for 2006, with a 550 replacing the 545 in the fall of 2005. The exterior of the design by Chris Bangle and Adrian van Hooydonk is controversial, as is BMW’s new iDrive interface for accessing things like the radio and HVAC controls.