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Both the Q8 and GLC Coupe 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 GLC Coupe’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 GLC Coupe 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 GLC Coupe doesn’t offer Hill Descent Assist.
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 GLC Coupe doesn’t offer a night vision system.
To help make backing safer, the Q8’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 GLC Coupe doesn’t offer a cross-path warning system.
Both the Q8 and the GLC Coupe have standard driver and passenger frontal airbags, front 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, rearview cameras, available lane departure warning systems, blind spot warning systems and around view monitors.
The Audi Q8 weighs 859 to 959 pounds more than the Mercedes GLC Coupe. 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 GLC Coupe’s (12 vs. 5 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 Mercedes vehicles. J.D. Power ranks Audi 13th in reliability, above the industry average. With 6 more problems per 100 vehicles, Mercedes is ranked 15th.
From surveys of all its subscribers, Consumer Reports’ December 2018 Auto Issue reports that Audi vehicles are more reliable than Mercedes vehicles. Consumer Reports ranks Audi 10 places higher in reliability than Mercedes.
The Q8’s 3.0 turbo V6 hybrid produces 94 more horsepower (335 vs. 241) and 96 lbs.-ft. more torque (369 vs. 273) than the GLC 300 Coupe’s standard 2.0 turbo 4 cyl.
Regenerative brakes improve the Q8’s fuel efficiency by converting inertia back into energy instead of wasting it. The GLC Coupe doesn’t offer a regenerative braking system.
To lower fuel costs and make buying fuel easier, the Audi Q8 uses regular unleaded gasoline (premium recommended for maximum performance). The GLC Coupe requires premium, which can cost 20 to 55 cents more per gallon.
The Q8 has 5.1 gallons more fuel capacity than the GLC Coupe (22.5 vs. 17.4 gallons), for longer range between fill-ups.
For better stopping power the Q8’s brake rotors are larger than those on the GLC Coupe:
For better traction, the Q8 has larger standard tires than the GLC Coupe (275/50R20 vs. 235/55R19). The Q8’s optional tires are larger than the largest tires available on the GLC Coupe (285/45R21 vs. 255/45R20).
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 GLC Coupe’s standard 55 series tires. The Q8’s optional tires have a lower 40 series profile than the GLC Coupe’s optional 45 series front tires.
For better ride, handling and brake cooling the Q8 has standard 20-inch wheels. Smaller 19-inch wheels are standard on the GLC Coupe. The Q8’s optional 22-inch wheels are larger than the 21-inch wheels optional on the GLC Coupe.
For a smoother ride and more stable handling, the Q8’s wheelbase is 4.8 inches longer than on the GLC Coupe (117.9 inches vs. 113.1 inches).
For better handling and stability, the track (width between the wheels) on the Q8 is 2.3 inches wider in the front and 3.1 inches wider in the rear than on the GLC Coupe.
The design of the Audi Q8 amounts to more than styling. The Q8 has an aerodynamic coefficient of drag of .35 Cd. That is lower than the GLC Coupe (.369). A more efficient exterior helps keep the interior quieter and helps the Q8 get better fuel mileage.
The Q8 has .9 inches more front legroom, 2.2 inches more front shoulder room, 3 inches more rear legroom and 2.7 inches more rear shoulder room than the GLC Coupe.
The Q8 has a much larger cargo volume with its rear seat up than the GLC Coupe with its rear seat up (28.6 vs. 17.6 cubic feet). The Q8 has a much larger cargo volume with its rear seat folded than the GLC Coupe with its rear seat folded (67.5 vs. 49.4 cubic feet).
The Q8’s standard towing capacity is much higher than the GLC Coupe’s (7700 vs. 3500 pounds).
J.D. Power and Associates surveys of service recipients show that Audi service is better than Mercedes. J.D. Power ranks Audi third in service department satisfaction. With a 3% lower rating, Mercedes is ranked 6th.
The Q8 has a standard remote vehicle starting system, so the vehicle can be started from inside the driver's house. This allows the driver to comfortably warm up the engine before going out to the vehicle. The climate system will also automatically heat or cool the interior. The GLC Coupe doesn’t offer a remote starting system.
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 GLC Coupe 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 GLC Coupe doesn’t offer a rear sunshade.
© 1991-2018 Advanta-STAR Automotive Research. All rights reserved.
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