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For enhanced safety, the front and rear seat shoulder belts of the Audi S6 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 CT5 V-Series doesn’t offer pretensioners for the rear seat belts.
Both the S6 and CT5 V-Series have child safety locks to prevent children from opening the rear doors. The S6 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 CT5 V-Series’ 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 S6 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 CT5 V-Series 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 S6. But it costs extra on the CT5 V-Series.
A passive infrared night vision system optional on the S6 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 CT5 V-Series doesn’t offer a night vision system.
Both the S6 and the CT5 V-Series have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee 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, daytime running lights, rearview cameras, available blind spot warning systems and rear cross-path warning.
The S6’s corrosion warranty is 6 years longer than the CT5 V-Series’ (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 S6’s 2.9 turbo V6 hybrid produces 84 more horsepower (444 vs. 360) and 38 lbs.-ft. more torque (443 vs. 405) than the CT5 V-Series’ 3.0 turbo V6.
On the EPA test cycle the S6 SMG gets better fuel mileage than the CT5 V-Series AWD (18 city/28 hwy vs. 17 city/25 hwy).
On the EPA test cycle the S6 Auto gets better fuel mileage than the CT5 V-Series AWD (18 city/28 hwy vs. 17 city/25 hwy).
Regenerative brakes improve the S6’s fuel efficiency by converting inertia back into energy instead of wasting it. The CT5 V-Series doesn’t offer a regenerative braking system.
The S6 has 1.8 gallons more fuel capacity than the CT5 V-Series (19.3 vs. 17.5 gallons), for longer range between fill-ups.
The S6 offers a standard sequential manual gearbox (SMG). With no clutch pedal to worry about and a fully automatic mode, an SMG is much more efficient than a conventional automatic but just as easy to drive. The CT5 V-Series doesn’t offer an SMG or a conventional manual transmission.
For better stopping power the S6’s brake rotors are larger than those on the CT5 V-Series:
The S6’s standard front and rear disc brakes are vented to help dissipate heat for shorter stops with less fading. The rear discs on the CT5 V-Series are solid, not vented.
For better traction, the S6 has larger tires than the CT5 V-Series (255/40R20 vs. 245/40R19).
The S6’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 CT5 V-Series’ 40 series tires.
For better ride, handling and brake cooling the S6 has standard 20-inch wheels. Only 19-inch wheels are available on the CT5 V-Series. The S6 offers optional 21-inch wheels.
The front and rear suspension of the S6 uses air springs for a smoother, controlled ride than the CT5 V-Series, which uses coil springs. Air springs maintain proper ride height and ride more smoothly.
For better handling and stability, the track (width between the wheels) on the S6 is 1.5 inches wider in the front than on the CT5 V-Series.
The S6 has 1.1 inches more front shoulder room, 1.5 inches more rear headroom and .8 inches more rear shoulder room than the CT5 V-Series.
The S6 has a much larger trunk than the CT5 V-Series (13.7 vs. 11.9 cubic feet).
With its sedan body style, valet key, locking rear seatbacks and remote trunk release lockout, the S6 offers cargo security. The CT5 V-Series’ non-lockable folding seat defeats cargo security.
To make loading and unloading groceries and cargo easier, especially for short adults, the S6 offers an optional power trunk, which opens and closes automatically by pressing a button or just by kicking your foot under the back bumper, completely leaving your hands free. The CT5 V-Series doesn’t offer a power trunk, so its trunk has to be closed manually.
Unlike the driver-only memory system in the CT5 V-Series, the S6 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.
In poor weather, headlights can lose their effectiveness as grime builds up on their lenses. This can reduce visibility without the driver realizing. The S6 has standard headlight washers to keep headlight output high. The CT5 V-Series doesn’t offer headlight washers.
The CT5 V-Series’ optional cornering lamps activate a lamp on the front corner when the turn signal is activated. The S6’s standard 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.
A power rear sunshade and manual rear side window sunshades are optional in the S6 Prestige to help block heat and glare for the rear passengers. The CT5 V-Series doesn’t offer a rear or rear side window sunshades.
The S6 has standard heated front seats. Heated front seats cost extra on the CT5 V-Series. The S6 also offers optional heated rear seats to keep those passengers extremely comfortable in the winter. Heated rear seats aren’t available in the CT5 V-Series.
The S6 has a standard heated steering wheel to take the chill out of steering on extremely cold winter days before the car heater warms up. A heated steering wheel costs extra on the CT5 V-Series.
The Audi A6/S6 outsold the Cadillac CTS/CT5 by almost three to one during 2019.
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