The BMW X5 xDrive30i ($47,500) and xDrive35d ($51,200), have the same standard equipment, but different engines.   The 30i is powered by a 3.0-liter inline six-cylinder engine delivering 260 horsepower and 225 pound-feet of torque, while the 35d has a twin-turbocharged 3.0-liter diesel engine that makes 265 horsepower and an impressive 425 pound-feet of torque.   The diesel also qualifies for a federal tax credit of roughly $1,500.   Standard equipment on both models includes vinyl upholstery; 10-way power-adjustable front seats; dual-zone automatic climate control; interior air filter; memory for the driver's seat, mirrors and steering wheel; cruise control; leather-wrapped, power tilt/telescoping steering wheel with audio controls; split-folding second-row seat; power windows, locks and heated exterior mirrors with tilt-down back-up aid; remote keyless entry; sunroof; 12-speaker AM/FM/CD stereo with high-definition radio; rain-sensing wipers; trip computer; automatic headlights; rear cargo cover; fog lights; roof rails; adaptive xenon headlights; and P255/55R18 run-flat tires on alloy wheels.  

The BMW X5 xDrive48i ($56,200) is powered by a gasoline V8 with 350 horsepower and 350 pound-feet of torque.   It also adds leather upholstery, wood interior trim, and a load-leveling air suspension.  

The X5 M ($85,400) has a high-performance twin-turbocharged 4.4-liter V8 that makes 555 horsepower and 500 pound-feet of torque.   To the xDrive48i, the X5 M adds heated M front sport bucket seats, an M steering wheel, the M Drive control system, auto-dimming outside and rearview mirrors, universal garage door opener, BMW Assist concierge service, a navigation system with voice recognition and real-time traffic information, hill ascent control, front and rear park assist, an upgraded sound system with 16 speakers and 600 watts of power, headlight washers, larger brakes, sport suspension, Active Roll Stabilization, and P275/40R20 front and 315/35R20 rear tires.   It also has aluminum interior trim in place of wood.  

Options are clustered in packages.   The Technology Package ($2,800) includes front and rear park assist, a rearview camera and a navigation system with voice command and real-time traffic information.   The Cold Weather Package ($1,250) adds retractable headlight washers, heated steering wheel, heated front and rear seats and a ski bag with rear-seat pass-through, while the Rear Climate Package ($900) adds four-zone climate control, manual rear sunshades and privacy glass.   A Driver Assistance package ($1,800) adds a rearview camera, a head-up display, and self-dimming headlights.  

The M Sport Package ($6,500) includes an increased top-speed limiter, M sport seats, M sport steering wheel, aluminum roof rails, a black headliner, adaptive suspension with Active Roll Stabilization, 19-inch wheels, heavily bolstered sport seats, shadowline interior trim, and Anthracite exterior trim.   A Premium Package ($2,200-$3,400) adds leather upholstery, front-seat power lumbar support, power tailgate, auto-dimming interior and exterior mirrors, digital compass, power-folding exterior mirrors, universal garage door opener, Bluetooth phone interface, and BMW Assist with a 4-year subscription.  

Options available as standalones include a premium sound system with 16 speakers, a six-CD changer and an iPod adapter ($1,400-$2,000), Active Ventilated 20-way front seats with a massage feature for the driver ($2,100), rear-seat DVD entertainment system ($1,700), ultra-soft Nappa leather ($2,400-$3,850), Comfort Access keyless starting ($1,000), satellite radio ($350), iPod and USB adaptor ($400), leather dashboard and console trim ($1,900), split-folding third-row seat with self-leveling rear suspension ($1,700), head-up display ($1,300), Active Steering ($1,500), and running boards ($300).  

Safety features include front airbags with two-stage activation, side-impact airbags built into the front seats, first- and second-row curtain-style airbags with rollover deployment, and a tire-pressure monitor.   Active safety features include hill-descent control, electronic stability control with rollover mitigation, traction control, and advanced anti-lock brakes with a brake assist, pre-loading and water-sweeping feature.   All X5 models come standard with run-flat tires, which allow operation at 50 mph for up to 90 miles when completely flat.