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For enhanced safety, the front and rear seat shoulder belts of the Audi Q8 have pretensioners to tighten the seatbelts and eliminate dangerous slack in the event of a collision and force limiters to limit the pressure the belts will exert on the passengers. The Acura RDX doesn’t offer pretensioners for the rear seat belts.
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 RDX doesn’t offer pre-crash pretensioners.
Both the Q8 and RDX 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 RDX’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 RDX 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.
To provide maximum traction and stability on all roads, All-Wheel Drive is standard on the Q8. But it costs extra on the RDX.
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 RDX doesn’t offer a night vision system.
Both the Q8 and the RDX have standard driver and passenger frontal airbags, front side-impact airbags, side-impact head airbags, height adjustable front shoulder belts, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, rearview cameras, available lane departure warning systems, blind spot warning systems, around view monitors and rear cross-path warning.
The Audi Q8 weighs 936 to 1221 pounds more than the Acura RDX. The NHTSA advises that heavier vehicles are much safer in collisions than their significantly lighter counterparts.
The Q8’s corrosion warranty is 7 years longer than the RDX’s (12 vs. 5 years).
There are over 11 percent more Audi dealers than there are Acura dealers, which makes it easier should you ever need service under the Q8’s warranty.
J.D. Power and Associates’ 2018 survey of the owners of three-year-old vehicles provides the long-term dependability statistics that show that Audi vehicles are more reliable than Acura vehicles. J.D. Power ranks Audi 13th in reliability, above the industry average. With 18 more problems per 100 vehicles, Acura is ranked 20th.
From surveys of all its subscribers, Consumer Reports’ December 2018 Auto Issue reports that Audi vehicles are more reliable than Acura vehicles. Consumer Reports ranks Audi 6 places higher in reliability than Acura.
The Q8’s 3.0 turbo V6 hybrid produces 63 more horsepower (335 vs. 272) and 89 lbs.-ft. more torque (369 vs. 280) than the RDX’s 2.0 turbo 4 cyl.
Regenerative brakes improve the Q8’s fuel efficiency by converting inertia back into energy instead of wasting it. The RDX doesn’t offer a regenerative braking system.
The Q8 has 5.4 gallons more fuel capacity than the RDX (22.5 vs. 17.1 gallons), for longer range between fill-ups.
For better stopping power the Q8’s brake rotors are larger than those on the RDX:
The Q8’s standard front and rear disc brakes are vented to help dissipate heat for shorter stops with less fading. The rear discs on the RDX are solid, not vented.
For better traction, the Q8 has larger standard tires than the RDX (275/50R20 vs. 235/55R19). The Q8’s optional tires are larger than the largest tires available on the RDX (285/45R21 vs. 255/40R20).
The Q8’s standard tires provide better handling because they have a lower 50 series profile (height to width ratio) that provides a stiffer sidewall than the RDX’s standard 55 series tires.
For better ride, handling and brake cooling the Q8 has standard 20-inch wheels. Smaller 19-inch wheels are standard on the RDX. The Q8’s optional 22-inch wheels are larger than the 20-inch wheels on the RDX A-Spec.
For a smoother ride and more stable handling, the Q8’s wheelbase is 9.6 inches longer than on the RDX (117.9 inches vs. 108.3 inches).
For better handling and stability, the track (width between the wheels) on the Q8 is 1.9 inches wider in the front and 2.1 inches wider in the rear than on the RDX.
The Q8 has .1 inches more front legroom, 1.8 inches more rear legroom and 1.9 inches more rear shoulder room than the RDX.
For enhanced passenger comfort on long trips the Q8’s rear seats recline. The RDX’s rear seats don’t recline.
The Q8’s standard towing capacity is much higher than the RDX’s (7700 vs. 1500 pounds).
The engine in the Q8 is mounted longitudinally (North-South), instead of sideways, as in the RDX. This makes it easier to service and maintain, because the accessory belts are in front.
J.D. Power and Associates surveys of service recipients show that Audi service is better than Acura. J.D. Power ranks Audi third in service department satisfaction. With a 26% lower rating, Acura is ranked 12th.
Unlike the driver-only memory system in the RDX, the Q8 offers an optional 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 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 RDX’s standard intermittent wipers change speed with vehicle speed, but can’t turn on and off or change speed based on changing rainfall.
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 Prestige has standard headlight washers to keep headlight output high. The RDX doesn’t offer headlight washers.
A manual rear sunshade is optional in the Q8 to help block heat and glare for the rear passengers. The RDX doesn’t offer a rear sunshade.
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