Both the xDrive35i and the xDrive50i use an 8-speed automatic transmission, first introduced in the 5-series Grand Turismo. Brake energy regeneration is also used on both gasoline engines, which uncouples the alternator from the accessory drive system, allowing the battery to only be charged during coasting or braking. This, BMW says, results in up to 2 percent fuel economy boost. The X5 M features a 6-speed automatic as the only transmission option.
Standard safety features include several airbags--driver's and passenger's front and side units as well as head airbags for the first- and second-row seats. In addition, BMW offers Dynamic Stability Control, Dynamic Traction Control, Dynamic Brake Control, Hill Descent Control and Dynamic Cruise Control. Active Cruise Control and Lane Departure Warning systems are also available. There's also a rearview camera that can provide a 360-degree exterior view, a Heads-Up Display that projects onto the windshield in the driver's field of view and a Park Distance Control system that alerts the driver of obstacles behind the vehicle while parking.
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