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Both the S6 and AMG C-Class Sedan 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 AMG C-Class Sedan’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.
To provide maximum traction and stability on all roads, All-Wheel Drive is standard on the S6. But it costs extra on the AMG C-Class Sedan.
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 AMG C-Class Sedan doesn’t offer a night vision system.
Both the S6 and the AMG C-Class Sedan have standard driver and passenger frontal airbags, front side-impact airbags, driver knee airbags, side-impact head airbags, front and rear seatbelt pretensioners, 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 Audi S6 weighs 586 to 727 pounds more than the Mercedes AMG C-Class Sedan. The NHTSA advises that heavier cars are much safer in collisions than their significantly lighter counterparts.
The S6’s corrosion warranty is 7 years longer than the AMG C-Class Sedan’s (12 vs. 5 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 Mercedes vehicles. J.D. Power ranks Audi 8th in reliability, above the industry average. With 10 more problems per 100 vehicles, Mercedes is ranked 13th.
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 S6’s 2.9 turbo V6 hybrid produces 59 more horsepower (444 vs. 385) and 59 lbs.-ft. more torque (443 vs. 384) than the AMG C 43 Sedan’s standard 3.0 turbo V6.
The S6 has 1.9 gallons more fuel capacity than the AMG C-Class Sedan (19.3 vs. 17.4 gallons), for longer range between fill-ups.
For better stopping power the S6’s brake rotors are larger than those on the AMG C-Class Sedan:
AMG C-Class Sedan
For better traction, the S6 has larger tires than the AMG C-Class Sedan (255/40R20 vs. 225/45R18). The S6’s tires are larger than the largest tires available on the AMG C-Class Sedan (255/40R20 vs. 245/40R18).
The S6’s standard tires provide better handling because they have a lower 40 series profile (height to width ratio) that provides a stiffer sidewall than the AMG C 43 Sedan’s standard 45 series front tires.
For better ride, handling and brake cooling the S6 has standard 20-inch wheels. Smaller 18-inch wheels are standard on the AMG C 63 Sedan. The S6’s optional 21-inch wheels are larger than the 19-inch wheels optional on the AMG C-Class Sedan.
The front and rear suspension of the S6 uses air springs for a smoother, controlled ride than the AMG C-Class Sedan, which uses coil springs. Air springs maintain proper ride height and ride more smoothly.
For a smoother ride and more stable handling, the S6’s wheelbase is 3.5 inches longer than on the AMG C-Class Sedan (115.3 inches vs. 111.8 inches).
For better handling and stability, the track (width between the wheels) on the S6 is 1.1 inches wider in the front and 2.8 inches wider in the rear than the average track on the AMG C-Class Sedan.
Because it has more passenger and cargo room, the EPA rates the S6 a Mid-size car, while the AMG C-Class Sedan is rated a Compact.
The S6 has 7 cubic feet more passenger volume than the AMG C-Class Sedan (99 vs. 92).
The S6 has .9 inches more front headroom, 2.5 inches more front shoulder room, 1 inch more rear headroom, 2.2 inches more rear legroom and 1.5 inches more rear shoulder room than the AMG C-Class Sedan.
The S6 has a much larger trunk than the AMG C Sedan (13.7 vs. 12.6 cubic feet).
The S6’s instruments include an oil pressure gauge and a temperature gauge - which could save your engine! Often ‘idiot lights’ don’t warn you until damage has been done. The AMG C-Class Sedan does not have an oil pressure gauge.
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 AMG C-Class Sedan doesn’t offer headlight washers.
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 AMG C-Class Sedan doesn’t offer rear side window sunshades.
Both the S6 and the AMG C-Class Sedan have standard heated front seats. 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 AMG C-Class Sedan.
On extremely cold winter days, the S6’s standard heated steering wheel provides comfort, allowing the driver to steer safely and comfortably before the car heater warms up. The AMG C-Class Sedan doesn’t offer a heated steering wheel.
The S6 Prestige offers optional massaging front seats in order to maximize comfort and eliminate fatigue on long trips. Massaging seats aren’t available in the AMG C-Class Sedan.
To quickly and conveniently keep personal devices charged without cables tangling and wearing out, the Audi S6 has a standard wireless phone charging system (Qi) in the center console. Wireless charging costs extra on the AMG C-Class Sedan.
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