The 2015 BMW 5 Series is a comfortable, technologically advanced midsize luxury sedan with a very appealing set of skills. The base 528i starts with the four-cylinder engine, 17-inch wheels, adjustable drive settings (for steering, throttle and automatic transmission response), adaptive xenon headlights with LED accent lights, LED foglights, adaptive brake lights, automatic wipers, heated mirrors, a sunroof, cruise control and auto-dimming mirrors. Inside theres dual-zone automatic climate control, dark wood trim, ambient lighting, 10-way power front seats (with four-way power lumbar), driver memory functions, split-folding rear seats, leatherette premium vinyl upholstery and a power tilt-and-telescoping leather-wrapped steering wheel. Technology features include BMW Assist emergency communications, the iDrive electronics interface (with a 10.2-inch widescreen display and smartphone app integration), a navigation system, Bluetooth phone and audio connectivity, and a 10-speaker sound system with a CD player, HD radio, an auxiliary audio jack and a USB port. The 535i adds a six-cylinder engine, 18-inch wheels and leather upholstery, but is otherwise similarly equipped. The 550i upgrades to a V8 engine, a hands-free power trunk lid (opening or closing automatically when you pass your foot under the rear bumper), keyless entry and ignition, a sport version of the automatic transmission with steering-wheel-mounted shift paddles, front and rear parking sensors, a rearview camera and 20-way multicontour power front seats (with four-way power lumbar). The 550i offers the Executive package, which adds soft-closing doors, ceramic-trimmed interior controls, a leather dashboard, a head-up display, an upgraded instrument cluster display and a 16-speaker Harman Kardon audio system with satellite radio. Standard safety equipment for the 2015 BMW 5 Series includes stability and traction control, antilock disc brakes, front-seat side airbags, side curtain airbags and active front head restraints.