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Both the S8 and CT6-V have child safety locks to prevent children from opening the rear doors. The S8 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-V’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 S8 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-V doesn’t offer front seat center airbags.
The S8 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-V 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.
The S8 has a standard Top View Camera System to allow the driver to see objects all around the vehicle on a screen. The CT6-V only offers a rear monitor and front and rear parking sensors that beep or flash a light. That doesn’t help with obstacles to the sides.
Both the S8 and the CT6-V 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, all wheel drive, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, lane departure warning systems, rearview cameras, available night vision systems, blind spot warning systems and rear cross-path warning.
The Audi S8 weighs 822 pounds more than the Cadillac CT6-V. The NHTSA advises that heavier cars are much safer in collisions than their significantly lighter counterparts.
The S8’s corrosion warranty is 6 years longer than the CT6-V’s (12 vs. 6 years).
J.D. Power and Associates’ 2019 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 8th in reliability, above the industry average. With 42 more problems per 100 vehicles, Cadillac is ranked 23rd.
From surveys of all its subscribers, Consumer Reports’ December 2019 Auto Issue reports that Audi vehicles are more reliable than Cadillac vehicles. Consumer Reports ranks Audi 16 places higher in reliability than Cadillac.
The S8’s 4.0 turbo V8 hybrid produces 13 more horsepower (563 vs. 550) than the CT6-V’s 4.2 turbo V8.
Regenerative brakes improve the S8’s fuel efficiency by converting inertia back into energy instead of wasting it. The CT6-V doesn’t offer a regenerative braking system.
The S8 has 2.5 gallons more fuel capacity than the CT6-V (21.7 vs. 19.2 gallons), for longer range between fill-ups.
The S8 offers optional heat-treated ceramic brake rotors, which last ten to twenty times as long as conventional cast iron rotors, don’t rust, don’t fade during repeated high speed braking, and their lighter weight contribute to better braking, handling and acceleration. The CT6-V doesn’t offer ceramic brake rotors.
For better traction, the S8 has larger tires than the CT6-V (265/40R20 vs. 245/40R20).
The S8’s optional tires provide better handling because they have a lower 35 series profile (height to width ratio) that provides a stiffer sidewall than the CT6-V’s 40 series tires.
For better ride, handling and brake cooling the S8 offers optional 21-inch wheels. The CT6-V’s largest wheels are only 20-inches.
The front and rear suspension of the S8 uses air springs for a smoother, controlled ride than the CT6-V, which uses coil springs. Air springs maintain proper ride height and ride more smoothly.
The S8 has a standard automatic front and rear load leveling suspension to keep ride height level with a heavy load or when towing. The S8’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-V doesn’t offer a load leveling suspension.
The S8 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-V.
A low lift-over trunk design makes loading and unloading the S8 easier. The S8’s trunk lift-over height is 27.4 inches, while the CT6-V’s liftover is 29.1 inches.
In poor weather, headlights can lose their effectiveness as grime builds up on their lenses. This can reduce visibility without the driver realizing. The S8 offers available headlight washers to keep headlight output high. The CT6-V doesn’t offer headlight washers.
The CT6-V’s cornering lamps activate a lamp on the front corner when the turn signal is activated. The S8’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 S8 has standard front air-conditioned seats and offers them optionally in the rear. This keeps the passengers comfortable and takes the sting out of hot seats in summer. The CT6-V doesn’t offer air-conditioned seats in the rear.
On extremely cold winter days, the S8’s standard heated steering wheel provides comfort, allowing the driver to steer safely and comfortably before the car heater warms up. The CT6-V doesn’t offer a heated steering wheel.
The S8 has standard massaging front seats. Massaging front seats are only available on the CT6-V Platinum. The S8 also offers optional massaging rear seats in order to maximize comfort and eliminate fatigue on long trips. Massaging rear seats aren’t available in the CT6-V.
The S8 offers an optional 115-volt a/c outlet on the center console, allowing you to recharge a laptop or run small household appliances without special adapters that can break or get misplaced. The CT6-V doesn’t offer a house-current electrical outlet.
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