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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 Cadillac XT5 doesn’t offer pretensioners for the rear seat belts.
Both the Q8 and XT5 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 XT5’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 XT5 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 XT5.
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 XT5 doesn’t offer a night vision system.
Both the Q8 and the XT5 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, rearview cameras, available lane departure warning systems, blind spot warning systems, around view monitors and rear cross-path warning.
The Audi Q8 weighs 648 to 1019 pounds more than the Cadillac XT5. The NHTSA advises that heavier vehicles are much safer in collisions than their significantly lighter counterparts.
The Q8’s corrosion warranty is 6 years longer than the XT5’s (12 vs. 6 years).
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 Cadillac vehicles. J.D. Power ranks Audi 13th in reliability, above the industry average. With 45 more problems per 100 vehicles, Cadillac is ranked 27th.
From surveys of all its subscribers, Consumer Reports’ December 2018 Auto Issue reports that Audi vehicles are more reliable than Cadillac vehicles. Consumer Reports ranks Audi 21 places higher in reliability than Cadillac.
The Q8’s 3.0 turbo V6 hybrid produces 25 more horsepower (335 vs. 310) and 98 lbs.-ft. more torque (369 vs. 271) than the XT5’s 3.6 DOHC V6.
Regenerative brakes improve the Q8’s fuel efficiency by converting inertia back into energy instead of wasting it. The XT5 doesn’t offer a regenerative braking system.
The Q8 has 3.1 gallons more fuel capacity than the XT5 FWD’s standard fuel tank (22.5 vs. 19.4 gallons), for longer range between fill-ups.
For better stopping power the Q8’s brake rotors are larger than those on the XT5:
For better traction, the Q8 has larger standard tires than the XT5 (275/50R20 vs. 235/65R18). The Q8’s optional tires are larger than the largest tires available on the XT5 (285/45R21 vs. 235/65R18).
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 XT5’s standard 65 series tires. The Q8’s optional tires have a lower 40 series profile than the XT5’s optional 55 series tires.
For better ride, handling and brake cooling the Q8 has standard 20-inch wheels. Smaller 18-inch wheels are standard on the XT5. The Q8’s optional 22-inch wheels are larger than the 20-inch wheels optional on the XT5.
For a smoother ride and more stable handling, the Q8’s wheelbase is 5.4 inches longer than on the XT5 (117.9 inches vs. 112.5 inches).
For better handling and stability, the track (width between the wheels) on the Q8 is 1.7 inches wider in the front and 2.4 inches wider in the rear than on the XT5.
The Q8 has .5 inches more front legroom, 1.2 inches more front shoulder room, 2.1 inches more rear headroom, .7 inches more rear legroom and 2.3 inches more rear shoulder room than the XT5.
The Q8 has a larger cargo area with its rear seat folded than the XT5 with its rear seat folded (67.5 vs. 63 cubic feet).
The Q8’s standard towing capacity is much higher than the XT5’s (7700 vs. 1000 pounds).
The engine in the Q8 is mounted longitudinally (North-South), instead of sideways, as in the XT5. This makes it easier to service and maintain, because there are no rear spark plugs and the accessory belts are in front.
Unlike the driver-only memory system optional at extra cost in the XT5, 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 standard easy entry system raises the steering wheel and glides the driver’s seat back, making it easier for the driver to get in and out. An easy entry system costs extra on the XT5.
The Q8’s front and rear power windows all open or close with one touch of the switches, making it more convenient at drive-up windows and toll booths, or when talking with someone outside of the car. The XT5’s rear power window switches have to be held the entire time to close them fully.
If the windows are left open on the Q8 Premium Plus/Prestige the driver can close them all at the outside door handle or from a distance using the remote. On a hot day the driver can lower the windows from a distance using the keyless remote. The driver of the XT5 can only close the windows from inside the vehicle, with the ignition on.
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 XT5’s standard manually variable intermittent wipers have to be constantly adjusted.
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 XT5 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 XT5 doesn’t offer a rear sunshade.
© 1991-2018 Advanta-STAR Automotive Research. All rights reserved.
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