The 2006 BMW 5 Series belongs to the car's fourth generation (E60), which brought a controversial design update. It was offered in sedan and wagon body styles with four main trims: 525i, 530i, 550i, and M5. Engine options ranged from a 215-hp 3.0L inline-six in the 525i, a 255-hp 3.0L inline-six in the 530i, a potent 360-hp 4.8L V8 in the 550i, to a track-ready 500-hp 5.0L V10 in the M5, a performance icon. All models were paired with a standard six-speed manual or optional six-speed automatic transmission, while the xDrive AWD was available for 525i and 530i. Notable features included a 10-speaker sound system, 2-zone automatic climate control, and BMW's iDrive infotainment system, which was often criticized for its complexity. Advanced safety features included stability control, traction control, antilock brakes, front-seat side airbags and front-and-rear head-protecting airbags.