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The A6 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 C-Class Sedan 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 A6. But it costs extra on the C-Class Sedan.
A passive infrared night vision system optional on the A6 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 C-Class Sedan doesn’t offer a night vision system.
Both the A6 and the C-Class Sedan have standard driver and passenger frontal airbags, front side-impact airbags, side-impact head airbags, front and rear seatbelt pretensioners, 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, around view monitors and rear cross-path warning.
The Audi A6 weighs 507 to 849 pounds more than the Mercedes C-Class Sedan. The NHTSA advises that heavier cars are much safer in collisions than their significantly lighter counterparts.
The A6’s corrosion warranty is 7 years longer than the C-Class Sedan’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 A6’s 3.0 turbo V6 hybrid produces 80 more horsepower (335 vs. 255) and 96 lbs.-ft. more torque (369 vs. 273) than the C 300 Sedan’s standard 2.0 turbo 4 cyl.
Regenerative brakes improve the A6’s fuel efficiency by converting inertia back into energy instead of wasting it. The C-Class Sedan doesn’t offer a regenerative braking system.
To lower fuel costs and make buying fuel easier, the Audi A6 uses regular unleaded gasoline (premium recommended for maximum performance). The C-Class Sedan requires premium, which can cost 20 to 55 cents more per gallon.
The A6 has 1.9 gallons more fuel capacity than the C-Class Sedan (19.3 vs. 17.4 gallons), for longer range between fill-ups.
The A6 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 C-Class Sedan doesn’t offer an SMG or a conventional manual transmission.
For better stopping power the A6’s standard brake rotors are larger than those on the C-Class Sedan:
For better traction, the A6 has larger standard tires than the C-Class Sedan (245/45R19 vs. 225/50R17). The A6’s optional tires are larger than the largest tires available on the C-Class Sedan (255/40R20 vs. 225/40R19).
The A6’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 C-Class Sedan’s standard 50 series tires. The A6 Prestige’s optional tires have a lower 35 series profile than the C-Class Sedan’s optional 40 series front tires.
For better ride, handling and brake cooling the A6 has standard 19-inch wheels. Smaller 17-inch wheels are standard on the C-Class Sedan. The A6 Prestige’s optional 21-inch wheels are larger than the 19-inch wheels optional on the C-Class Sedan.
For a smoother ride and more stable handling, the A6’s wheelbase is 3.3 inches longer than on the C-Class Sedan (115.1 inches vs. 111.8 inches).
For better handling and stability, the track (width between the wheels) on the A6 is 3.2 inches wider in the front and 2.8 inches wider in the rear than the average track on the C-Class Sedan.
For better maneuverability, the A6’s turning circle is .4 feet tighter than the C-Class Sedan’s (36.4 feet vs. 36.8 feet). The A6’s turning circle is 2.3 feet tighter than the AMG C 43 Sedan’s (36.4 feet vs. 38.7 feet).
The design of the Audi A6 amounts to more than styling. The A6 has an aerodynamic coefficient of drag of .29 Cd. That is lower than the C-Class Sedan (.3 to .32) and many sports cars. A more efficient exterior helps keep the interior quieter and helps the A6 get better fuel mileage.
The A6 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 C-Class Sedan.
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.
In poor weather, headlights can lose their effectiveness as grime builds up on their lenses. This can reduce visibility without the driver realizing. The A6 offers available headlight washers to keep headlight output high. The C-Class Sedan doesn’t offer headlight washers.
The A6 has standard heated front seats. Heated front seats cost extra on the C-Class Sedan. The A6 also offers optional heated rear seats to keep those passengers extremely comfortable in the winter. Heated rear seats aren’t available in the C-Class Sedan.
© 1991-2018 Advanta-STAR Automotive Research. All rights reserved.
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