A twin-turbocharged 4.4-liter V-8 isn't new to the BMW powertrain portfolio but in the XM it's partnered with an electric motor and a battery pack to create a whopping 644 horsepower. During our first test drive, we noted the powertrain's immediate punch and estimated that it should get the XM to 60 mph in about 3.8 seconds, but when we got it on our home turf for testing, it surprised us with a 3.4-second leap to 60 mph<br><br>Clean CARFAX. CARFAX One-Owner. 2023 BMW XM Base 4.4L V8 Adaptive Cruise Control, Backup Camera, Blind Spot Monitor, Bluetooth, Heated Seats, Homelink, Lane Departure Warning, Leather Seats, Memory Seat, Navigation System, 16 Speakers, 3.636 Axle Ratio, 4-Wheel Disc Brakes, ABS brakes, Adaptive suspension, Air Conditioning, Alloy wheels, AM/FM radio: SiriusXM, AM/FM Stereo, Auto High-beam Headlights, Auto tilt-away steering wheel, Auto-dimming door mirrors, Auto-dimming Rear-View mirror, Automatic temperature control, BMW Assist eCall, BMW TeleServices, Brake assist, Bumpers: body-color, Compass, Connected Package Pro, ConnectedDrive Services, Delay-off headlights, Door auto-latch, Driver door bin, Driver vanity mirror, Dual front impact airbags, Dual front side impact airbags, Electronic Stability Control, Emergency communication system: BMW Assist eCall, Extended Merino Leather Upholstery, Four wheel independent suspension, Front & Rear Heated Seats, Front anti-roll bar, Front Bucket Seats, Front Center Armrest, Front dual zone A/C, Front Massaging Seats, Front reading lights, Front Ventilated Seats, Fully automatic headlights, Garage door transmitter, Gesture Control, harman/kardon Surround Sound System, harman/kardonĀ® Speakers, Heads-Up Display, Heated door mirrors, Heated front seats, Heated rear seats, Heated steering wheel, Illuminated entry, Leather Shift Knob, Leather steering wheel, Live Cockpit Pro, Low tire pressure warning, M Sport Brakes w/Red Calipers, Memory seat, Multi-Function Seats w/Lumbar Support, Navigation System, Occu