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The X4’s pre-crash front seatbelts will tighten automatically in the event the vehicle detects an impending crash, improving protection against injury significantly. The QX30 doesn’t offer pre-crash pretensioners.
The X4 has standard Active Head Restraints, which use a specially designed headrest to protect the driver and front passenger from whiplash. During a rear-end collision, the Active Head Restraints system moves the headrests forward to prevent neck and spine injuries. The QX30 doesn’t offer a whiplash protection system.
Over 200 people are killed each year when backed over by motor vehicles. The X4 offers optional Active Park Distance Control which use rear sensors to monitor and automatically apply the brakes to prevent a rear collision. The QX30 doesn’t offer backup collision prevention brakes.
To provide maximum traction and stability on all roads, All-Wheel Drive is standard on the X4. But it costs extra on the QX30.
To help make backing safer, the X4’s optional cross-path warning system uses wide-angle radar in the rear bumper to alert the driver to vehicles approaching from the side, helping the driver avoid collisions. The QX30 doesn’t offer a cross-path warning system.
The X4’s driver alert monitor detects an inattentive driver then sounds a warning and suggests a break. According to the NHTSA, drivers who fall asleep cause about 100,000 crashes and 1500 deaths a year. The QX30 doesn’t offer a driver alert monitor.
Both the X4 and the QX30 have standard driver and passenger frontal airbags, front side-impact airbags, side-impact head airbags, front seatbelt pretensioners, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, rearview cameras, available lane departure warning systems, blind spot warning systems and around view monitors.
The BMW X4 weighs 672 to 1038 pounds more than the Infiniti QX30. The NHTSA advises that heavier vehicles are much safer in collisions than their significantly lighter counterparts.
The X4’s corrosion warranty is 5 years longer than the QX30’s (12 vs. 7 years).
BMW pays for scheduled maintenance on the X4 for 3 years and 36,000 miles. BMW will pay for oil changes, lubrication and any other required maintenance. Infiniti doesn’t pay scheduled maintenance for the QX30.
There are over 62 percent more BMW dealers than there are Infiniti dealers, which makes it much easier should you ever need service under the X4’s warranty.
J.D. Power and Associates’ 2018 Initial Quality Study of new car owners surveyed provide the statistics that show that BMW vehicles are better in initial quality than Infiniti vehicles. J.D. Power ranks BMW 11th in initial quality, above the industry average. With 5 more problems per 100 vehicles, Infiniti is ranked 14th.
The X4 xDrive30i’s standard 2.0 turbo 4 cyl. produces 40 more horsepower (248 vs. 208) than the QX30’s 2.0 turbo 4 cyl. The X4 M40i’s standard 3.0 turbo 6 cyl. produces 147 more horsepower (355 vs. 208) and 107 lbs.-ft. more torque (365 vs. 258) than the QX30’s 2.0 turbo 4 cyl.
As tested in Motor Trend the X4 M40i is faster than the Infiniti QX30:
Zero to 60 MPH
Speed in 1/4 Mile
The X4 has 4 gallons more fuel capacity than the QX30 FWD’s standard fuel tank (17.2 vs. 13.2 gallons), for longer range between fill-ups. The X4 has 2.4 gallons more fuel capacity than the QX30 AWD’s standard fuel tank (17.2 vs. 14.8 gallons).
An eight-speed automatic is standard on the BMW X4, for better acceleration and lower engine speed on the highway. Only a seven-speed automatic is available for the QX30.
For better stopping power the X4’s brake rotors are larger than those on the QX30:
The X4’s standard front and rear disc brakes are vented to help dissipate heat for shorter stops with less fading. The rear discs on the QX30 are solid, not vented.
For better traction, the X4 has larger standard tires than the QX30 (245/50R19 vs. 235/50R18). The X4’s optional tires are larger than the largest tires available on the QX30 (F:245/40R20 & R:275/40R20 vs. 235/50R18).
The X4 M40i’s optional 245/40R21 front and 275/35R21 rear tires provide better handling because they have a lower 40 series front and 35 series rear profile (height to width ratio) that provides a stiffer sidewall than the QX30’s optional 45 series tires.
For better ride, handling and brake cooling the X4 has standard 19-inch wheels. Smaller 18-inch wheels are standard on the QX30. The X4 M40i’s optional 21-inch wheels are larger than the 19-inch wheels optional on the QX30.
The X4 offers an optional space-saver spare tire so you can replace a flat tire and drive to have the flat repaired or replaced. A spare tire isn’t available on the QX30; it requires you to depend on its run-flat tires, which limits mileage and speed before they are repaired. If a run-flat is damaged beyond repair by a road hazard your vehicle will have to be towed.
The X4 offers an optional driver-adjustable suspension system. It allows the driver to choose between an extra-supple ride, reducing fatigue on long trips, or a sport setting, which allows maximum control for tricky roads or off-road. The QX30’s suspension doesn’t offer adjustable shock absorbers.
For a smoother ride and more stable handling, the X4’s wheelbase is 6.5 inches longer than on the QX30 (112.8 inches vs. 106.3 inches).
For better handling and stability, the average track (width between the wheels) on the X4 is 1.6 inches wider in the front and 3.3 inches wider in the rear than the average track on the QX30.
The X4’s front to rear weight distribution is more even (50.1% to 49.9%) than the QX30’s (59.7% to 40.3%). This gives the X4 more stable handling and braking.
The X4 M40i handles at .89 G’s, while the QX30 Sport pulls only .88 G’s of cornering force in a Motor Trend skidpad test.
The X4 M40i executes Motor Trend’s “Figure Eight” maneuver quicker than the QX30 Sport (25.6 seconds @ .73 average G’s vs. 26.1 seconds @ .71 average G’s).
The design of the BMW X4 amounts to more than styling. The X4 has an aerodynamic coefficient of drag of .3 Cd. That is lower than the QX30 (.31 to .34) and many sports cars. A more efficient exterior helps keep the interior quieter and helps the X4 get better fuel mileage.
The X4 has 9 cubic feet more passenger volume than the QX30 (97.8 vs. 88.8).
The X4 has .6 inches more front headroom, 2.7 inches more front shoulder room, 2 inches more rear legroom and 2.9 inches more rear shoulder room than the QX30.
The X4 has a larger cargo volume with its rear seat folded than the QX30 with its rear seat folded (50.5 vs. 34 cubic feet).
To make loading and unloading groceries and cargo easier, especially for short adults, the X4 has a standard power liftgate, which opens and closes automatically by pressing a button. The QX30 doesn’t offer a power liftgate.
The engine in the X4 is mounted longitudinally (North-South), instead of sideways, as in the QX30. This makes it easier to service and maintain, because the accessory belts are in front.
The X4 offers an optional heads-up display that projects speed and navigation instruction readouts in front of the driver’s line of sight, allowing drivers to view information without diverting their eyes from the road. The QX30 doesn’t offer a heads-up display.
The X4’s front and rear power windows all open or close fully with one touch of the switches, making it more convenient at drive-up windows and toll booths, or when talking with someone outside the car. The QX30’s rear power window switches have to be held the entire time to open or close them fully.
The X4’s rain-sensitive wipers adjust their speed and turn on and off automatically based on the amount of rainfall on the windshield. This allows the driver to concentrate on driving without constantly adjusting the wipers. The QX30’s standard manually variable intermittent wipers have to be constantly adjusted.
Both the X4 and the QX30 offer available heated front seats. The X4 also offers optional heated rear seats to keep those passengers extremely comfortable in the winter. Heated rear seats aren’t available in the QX30.
Optional air-conditioned seats in the X4 keep the driver and front passenger comfortable and take the sting out of hot seats in summer. The QX30 doesn’t offer air-conditioned seats.
On extremely cold winter days, the X4’s optional heated steering wheel provides comfort, allowing the driver to steer safely and comfortably before the vehicle heater warms up. The QX30 doesn’t offer a heated steering wheel.
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