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Both the A8 and CT6 have child safety locks to prevent children from opening the rear doors. The A8 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 CT6’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 A8 has a standard front seat center airbag, which deploys between the driver and front passenger, protecting them from injuries caused by striking each other in serious side impacts. The CT6 doesn’t offer front seat center airbags.
The A8 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 CT6 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 A8. But it costs extra on the CT6.
Both the A8 and the CT6 have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee airbags, side-impact head airbags, front seatbelt pretensioners, height adjustable front shoulder belts, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, daytime running lights, rearview cameras, available night vision systems, lane departure warning systems, blind spot warning systems, around view monitors and rear cross-path warning.
The A8’s corrosion warranty is 6 years longer than the CT6’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 A8’s 3.0 turbo V6 hybrid produces 70 more horsepower (335 vs. 265) and 74 lbs.-ft. more torque (369 vs. 295) than the CT6’s standard 2.0 turbo 4 cyl. The A8’s 3.0 turbo V6 hybrid produces 84 lbs.-ft. more torque (369 vs. 285) than the CT6’s optional 3.6 DOHC V6.
On the EPA test cycle the A8 gets better fuel mileage than the CT6 V6 AWD (19 city/27 hwy vs. 18 city/27 hwy). The A8 gets better fuel mileage than the CT6 3.0 twin turbo V6 AWD (19 city/27 hwy vs. 18 city/26 hwy).
Regenerative brakes improve the A8’s fuel efficiency by converting inertia back into energy instead of wasting it. The CT6 doesn’t offer a regenerative braking system.
To lower fuel costs and make buying fuel easier, the Audi A8 uses regular unleaded gasoline (premium recommended for maximum performance). The CT6 with the 3.0 turbo V6 engine requires premium, which can cost 20 to 55 cents more per gallon.
The A8 has 2.2 gallons more fuel capacity than the CT6 (21.7 vs. 19.5 gallons), for longer range between fill-ups.
For better stopping power the A8’s brake rotors are larger than those on the CT6:
CT6 AWD V6
For better traction, the A8 has larger standard tires than the CT6 (255/45R19 vs. 235/50R18). The A8’s optional tires are larger than the largest tires available on the CT6 (265/40R20 vs. 245/45R19).
The A8’s standard tires provide better handling because they have a lower 45 series profile (height to width ratio) that provides a stiffer sidewall than the CT6’s standard 50 series tires.
For better ride, handling and brake cooling the A8 has standard 19-inch wheels. Smaller 18-inch wheels are standard on the CT6.
The front and rear suspension of the A8 uses air springs for a smoother, controlled ride than the CT6, which uses coil springs. Air springs maintain proper ride height and ride more smoothly.
The A8 offers an available adjustable active suspension system, which counteracts cornering forces actively, limiting body roll and improving handling and stability. Cadillac doesn’t offer an active suspension on the CT6.
The A8 has a standard automatic front and rear load leveling suspension to keep ride height level with a heavy load or when towing. The A8’s height leveling suspension allows the driver to raise ride height for better off-road clearance and then lower it again for easier entering and exiting and better on-road handling. The CT6 doesn’t offer a load leveling suspension.
For better handling and stability, the track (width between the wheels) on the A8 is 1.3 inches wider in the front and .3 inches wider in the rear than on the CT6.
The A8 has .8 inches more front shoulder room, .5 inches more rear headroom, 3.9 inches more rear legroom and 1.4 inches more rear shoulder room than the CT6.
A standard locking glovebox (which can’t be accessed with the valet key) keeps your small valuables safer in the A8. The CT6 doesn’t offer locking storage for small valuables.
The A8’s standard towing capacity is much higher than the CT6’s (3500 vs. 1000 pounds).
In poor weather, headlights can lose their effectiveness as grime builds up on their lenses. This can reduce visibility without the driver realizing. The A8 has standard headlight washers to keep headlight output high. The CT6 doesn’t offer headlight washers.
The CT6 Premium Luxury/Platinum/Sport’s cornering lamps activate a lamp on the front corner when the turn signal is activated. The A8’s optional adaptive cornering lights turn the actual headlight unit up to several degrees, depending on steering wheel angle and vehicle speed. This lights a significant distance into corners at any speed.
The A8 will cost the buyer less in the long run because of its superior resale value. The IntelliChoice estimates that the A8 will retain 39.71% to 40.32% of its original price after five years, while the CT6 only retains -5.72% to 36.79%.
© 1991-2018 Advanta-STAR Automotive Research. All rights reserved.
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