Compare the2025 Audi Q8VS 2025 Infiniti QX55

Safety
Warranty
Engine
Fuel Economy and Range
Brakes and Stopping
Tires and Wheels
Suspension and Handling
Passenger Space
Cargo Capacity
Towing
Servicing Ease
Ergonomics
Economic Advantages
Recommendations

Safety

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The Q8’s pre-crash front seatbelts will tighten automatically in the event the vehicle detects an impending crash, improving protection against injury significantly. The QX55 doesn’t offer pre-crash pretensioners.

Both the Q8 and QX55 have child safety locks to prevent children from opening the rear doors. The Q8 has power child safety locks, allowing the driver to activate and deactivate them from the driver's seat and to know when they're engaged. The QX55’s child locks have to be individually engaged at each rear door with a manual switch. The driver can’t know the status of the locks without opening the doors and checking them.

The Q8 has a standard Secondary Collision Brake Assist, which automatically applies the brakes in the event of a crash to help prevent secondary collisions and prevent further injuries. The QX55 doesn’t offer a post collision braking system: in the event of a collision that triggers the airbags, more collisions are possible without the protection of airbags that may have already deployed.

When descending a steep, off-road slope, the Q8’s standard Hill Descent Assist allows you to creep down safely. The QX55 doesn’t offer Hill Descent Assist.

Earlier warning of stopped traffic, traffic signals, dangerous road conditions, weather, or accidents, can keep driver's safer and prevent crashes. The Q8 has Car-to-X Services, a system that seamlessly communicates important warnings to the driver about impending danger, if they're available. The QX55 doesn’t offer a system that can receive automated systems from infrastructure.

A passive infrared night vision system optional on the Q8 Prestige helps the driver to more easily detect people, animals or other objects in front of the vehicle at night. Using an infrared camera to detect heat, the system then displays the image on a monitor in the dashboard. The QX55 doesn’t offer a night vision system.

Both the Q8 and QX55 have rear cross-traffic warning, but the Q8 has Automatic Brake Activation (automatically applies the brakes) to better prevent a collision when backing near traffic. The QX55’s Rear Cross Traffic Alert doesn’t automatically brake.

The Q8’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 QX55 doesn’t offer a driver alert monitor.

Both the Q8 and the QX55 have standard driver and passenger frontal airbags, front and rear side-impact airbags, side-impact head airbags, front and rear seatbelt pretensioners, height adjustable front shoulder belts, four-wheel antilock brakes, all wheel drive, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, lane departure warning systems, blind spot warning systems, rearview cameras, rear cross-path warning and available around view monitors.

The Audi Q8 weighs 926 to 979 pounds more than the Infiniti QX55. The NHTSA advises that heavier vehicles are much safer in collisions than their significantly lighter counterparts.

The National Highway Traffic Safety Administration does 35 MPH front crash tests on new vehicles. In this test, results indicate that the Audi Q8 is safer than the Infiniti QX55:

	Q8	QX55
	Passenger
STARS	5 Stars	4 Stars
HIC	238	285
Chest Compression	.5 inches	1.2 inches
Neck Injury Risk	34%	37%
Neck Stress	120 lbs.	219 lbs.
Leg Forces (l/r)	47/47 lbs.	452/534 lbs.

New test not comparable to pre-2011 test results. More stars = Better. Lower test results = Better.

Side impacts caused 23% of all road fatalities in 2018, down from 29% in 2003, when the Insurance Institute for Highway Safety introduced its side barrier test. In order to continue improving vehicle safety, the IIHS has started using a more severe side impact test: 37 MPH (up from 31 MPH), with a 4180-pound barrier (up from 3300 pounds). The results of this newly developed test demonstrates that the Audi Q8 is safer than the QX55:

	Q8	QX55
Overall Evaluation	GOOD	ACCEPTABLE
Structure	GOOD	MARGINAL
	Driver Injury Measures
Head/Neck	GOOD	GOOD
Head Injury Criterion	86	141
Torso	GOOD	ACCEPTABLE
Torso Max Deflection	.94 in	1.73 in
Torso Deflection Rate	5 MPH	9 MPH
Pelvis	ACCEPTABLE	MARGINAL
Pelvis Force	937 lbs.	1316 lbs.
Head Protection	GOOD	GOOD
	Passenger Injury Measures
Head/Neck	GOOD	GOOD
Head Injury Criterion	40	57
Neck Compression	45 lbs.	89 lbs.
Torso	GOOD	GOOD
Shoulder Deflection	.43 in	.67 in
Shoulder Force	134 lbs.	201 lbs.
Torso Max Deflection	1.1 in	1.42 in
Pelvis	GOOD	GOOD
Head Protection	GOOD	GOOD

The Audi Q8 achieved a “Top Safety Pick” rating from the Insurance Institute for Highway Safety (IIHS) for the 2024 model year. This recognition was based on its impressive performance in the small overlap frontal crash test, updated side impact crash test, headlight evaluations, and pedestrian crash prevention testing. The QX55 is not a “Top Safety Pick” for 2024.

Warranty

The Q8’s corrosion warranty is 5 years longer than the QX55’s (12 vs. 7 years).

There are over 51 percent more Audi dealers than there are Infiniti dealers, which makes it much easier should you ever need service under the Q8’s warranty.

Engine

The Q8’s 3.0 turbo V6 hybrid produces 67 more horsepower (335 vs. 268) and 89 lbs.-ft. more torque (369 vs. 280) than the QX55’s 2.0 turbo 4-cylinder.

As tested in Motor Trend the Audi Q8 is faster than the Infiniti QX55:

	Q8	QX55
Zero to 60 MPH	5.9 sec	6.9 sec
Quarter Mile	14.4 sec	15.4 sec
Speed in 1/4 Mile	97.6 MPH	91.2 MPH

Fuel Economy and Range

Regenerative brakes improve the Q8’s fuel efficiency by converting inertia back into energy instead of wasting it. The QX55 doesn’t offer a regenerative braking system.

In heavy traffic or at stoplights the Q8’s engine automatically turns off when the vehicle is stopped, saving fuel and reducing pollution. The engine is automatically restarted when the driver gets ready to move again. If the conditions warrant or the driver wishes, the system can be manually disabled at any time for the duration of a trip. The QX55 doesn’t offer an automatic engine start/stop system.

The Q8 has 6.5 gallons more fuel capacity than the QX55 (22.5 vs. 16 gallons), for longer range between fill-ups.

Brakes and Stopping

For better stopping power the Q8’s brake rotors are larger than those on the QX55:

	Q8	QX55
Front Rotors	14.8 inches	13 inches
Rear Rotors	13.8 inches	12.1 inches

Tires and Wheels

For better traction, the Q8 has larger tires than the QX55 (285/45R21 vs. 255/45R20).

The Q8’s optional tires provide better handling because they have a lower 40 series profile (height to width ratio) that provides a stiffer sidewall than the QX55’s 45 series tires.

For better ride, handling and brake cooling the Q8 has standard 21-inch wheels. Only 20-inch wheels are available on the QX55. The Q8 offers optional 22-inch wheels.

The Q8 has a standard 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 QX55; 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.

Suspension and Handling

The Q8 has standard front and rear gas-charged shocks for better control over choppy roads. The QX55’s suspension doesn’t offer gas-charged shocks.

The Q8 has a standard 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 QX55’s suspension doesn’t offer adjustable shock absorbers.

The Q8 has a standard automatic load leveling suspension to keep ride height level with a heavy load or when towing. The QX55 doesn’t offer a load leveling suspension.

For a smoother ride and more stable handling, the Q8’s wheelbase is 7.7 inches longer than on the QX55 (117.9 inches vs. 110.2 inches).

For better handling and stability, the track (width between the wheels) on the Q8 is 1.7 inches wider in the front and 2.8 inches wider in the rear than on the QX55.

Passenger Space

The Q8 has 2 inches more front legroom, 1.6 inches more front shoulder room, 1.2 inches more rear headroom, 1.5 inches more rear legroom and 1.4 inches more rear shoulder room than the QX55.

Cargo Capacity

The Q8 has a much larger cargo volume with its rear seat up than the QX55 with its rear seat up (30.5 vs. 26.9 cubic feet). The Q8 has a much larger cargo volume with its rear seat folded than the QX55 with its rear seat folded (60.7 vs. 54.1 cubic feet).

Towing

The Q8 has a 7700 lbs. towing capacity. The QX55 has no towing capacity.

Servicing Ease

The engine in the Q8 is mounted longitudinally (North-South), instead of sideways, as in the QX55. This makes it easier to service and maintain, because the accessory belts are in front.

Ergonomics

Unlike the driver-only memory system in the QX55, the Q8 Prestige has a passenger memory, so that when drivers switch, the memory setting adjusts the driver’s seat, steering wheel position and outside mirror angle and the front passenger seat also adjusts to the new passenger’s preset preferences.

The power windows standard on both the Q8 and the QX55 have locks to prevent small children from operating them. When the lock on the Q8 is engaged the driver can still operate all of the windows, for instance to close one opened by a child. The QX55 prevents the driver from operating the other windows just as it does the other passengers.

The Q8’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 QX55’s standard intermittent wipers change speed with vehicle speed, but can’t turn on and off or change speed based on changing rainfall.

Heated windshield washer nozzles are standard on the Q8 to prevent washer fluid and nozzles from freezing and help continue to keep the windshield clear in sub-freezing temperatures. The QX55 doesn’t offer heated windshield washer nozzles.

Laser headlights, standard on the Q8 Prestige, produce their light by firing blue lasers through phosphorus, a process that uses one-half the power of the QX55’s LED headlights. Laser headlights can have double the range of LEDs with a much smaller surface area.

In poor weather, headlights can lose their effectiveness as grime builds up on their lenses. This can reduce visibility without the driver realizing. The Q8 has standard headlight washers to keep headlight output high. The QX55 doesn’t offer headlight washers.

A manual rear sunshade is optional in the Q8 and power rear side window sunshades are optional in the Q8 (except Premium) to help block heat and glare for the rear passengers. The QX55 doesn’t offer a rear or rear side window sunshades.

The Q8’s standard rear and side view mirrors have an automatic dimming feature. These mirrors can be set to automatically darken quickly when headlights shine on them, keeping following vehicles from blinding or distracting the driver. The QX55 has an automatic rear view mirror, but its side mirrors don’t dim.

Both the Audi Q8 and Infiniti QX55 offer exterior mirrors that can be folded to provide convenience. The Q8 features standard power folding mirrors, which allow for easy, one-touch folding or unfolding at the driver’s discretion. This provides added convenience when maneuvering or parking, as well as when walking past the parked vehicle. In comparison, the QX55’s foldable mirrors are manual, requiring the driver to get out and physically fold them once parked and unfold them before getting in.

The Q8 Prestige has standard massaging front seats in order to maximize comfort and eliminate fatigue on long trips. Massaging seats aren’t available in the QX55.

The Q8 Prestige’s Park Assist Plus can parallel park or back into a parking spot by itself, starting, stopping and changing direction automatically. Remote Park Assist Plus will park and retrieve your car remotely: press a button and watch it park itself. This is ideal for tight locations. The QX55 doesn’t offer an automated parking system.

Economic Advantages

The Q8 will cost the buyer less in the long run because of its superior resale value. The IntelliChoice estimates that the Q8 will retain 51.58% to 51.73% of its original price after five years, while the QX55 only retains 46.84% to 46.91%.

Recommendations

The Audi Q8/SQ8/RS Q8 outsold the Infiniti QX55 by almost three to one during 2023.

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