2020 Mercedes AMG C-Class Cabriolet vs. 2019 Audi S5

Detailed Review, Specifications & Comparison

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Safety

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The AMG C-Class Cabriolet’s driver alert monitor detects an inattentive driver then sounds a warning and suggests a break. According to the NHTSA, drivers who fall asleep cause about 100,000 crashes and 1500 deaths a year. The S5 doesn’t offer a driver alert monitor.

Both the AMG C-Class Cabriolet and the S5 have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee 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 lane departure warning systems, around view monitors and rear cross-path warning.

Warranty

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There are over 26 percent more Mercedes dealers than there are Audi dealers, which makes it easier should you ever need service under the AMG C-Class Cabriolet’s warranty.

Reliability

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J.D. Power and Associates’ 2019 Initial Quality Study of new car owners surveyed provide the statistics that show that Mercedes vehicles are better in initial quality than Audi vehicles. J.D. Power ranks Mercedes 12th in initial quality. With 12 more problems per 100 vehicles, Audi is ranked 22nd.

Engine

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The AMG C 43 Cabriolet’s standard 3.0 turbo V6 produces 36 more horsepower (385 vs. 349) and 15 lbs.-ft. more torque (384 vs. 369) than the S5’s 3.0 turbo V6. The AMG C 63 Cabriolet’s standard 4.0 turbo V8 produces 120 more horsepower (469 vs. 349) and 110 lbs.-ft. more torque (479 vs. 369) than the S5’s 3.0 turbo V6. The AMG C 63 S Cabriolet’s standard 4.0 turbo V8 produces 154 more horsepower (503 vs. 349) and 147 lbs.-ft. more torque (516 vs. 369) than the S5’s 3.0 turbo V6.

As tested in Car and Driver the AMG C 63 S Cabriolet 4.0 turbo V8 is faster than the Audi S5:

AMG C-Class Cabriolet

S5

Zero to 60 MPH

3.9 sec

4.3 sec

Zero to 80 MPH

5.9 sec

7.1 sec

Zero to 100 MPH

8.7 sec

10.9 sec

5 to 60 MPH Rolling Start

4.3 sec

5.6 sec

Passing 30 to 50 MPH

1.7 sec

2.8 sec

Passing 50 to 70 MPH

2.3 sec

3.5 sec

Quarter Mile

12.2 sec

12.9 sec

Speed in 1/4 Mile

119 MPH

107 MPH

Fuel Economy and Range

© 1999 - 2020 Advanta-STAR Automotive Research. All rights reserved. This vehicle comparison and all of the content in it are provided only by license from Advanta-STAR Automotive Research Corporation of America. If you are not a legally licensed user of this vehicle comparison, it is against federal law to access it, copy it, forward it or use it in any manner whatsoever. Any unauthorized use of this vehicle comparison is a violation of U.S. and international law and is punishable criminally and civilly. 6IUEX-0KENZ 45.55.47.189 2020/09/28

The AMG C-Class Cabriolet has 2.1 gallons more fuel capacity than the S5 (17.4 vs. 15.3 gallons), for longer range between fill-ups.

Transmission

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A nine-speed automatic (SMG) is standard on the Mercedes AMG C-Class Cabriolet, for better acceleration and lower engine speed on the highway. Only an eight-speed automatic is available for the S5.

The AMG C-Class Cabriolet offers an available 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 S5 doesn’t offer an SMG or a conventional manual transmission.

The AMG C-Class Cabriolet V8’s launch control uses engine electronics to hold engine RPM’s precisely in order to provide the most stable and rapid acceleration possible, using all of the available traction. The S5 doesn’t offer launch control.

Brakes and Stopping

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For better stopping power the AMG C-Class Cabriolet’s front brake rotors are larger than those on the S5:

AMG C 43 Cabriolet

AMG C 63 S Cabriolet

S5

Front Rotors

14.2 inches

15.8 inches

13.8 inches

Rear Rotors

12.6 inches

14.2 inches

13 inches

The AMG C-Class Cabriolet S 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 S5 doesn’t offer ceramic brake rotors.

Tires and Wheels

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Changing a flat tire near traffic can be dangerous and inconvenient. The run-flat tires available on the AMG C-Class Cabriolet can be driven up to 50 miles without any air pressure, allowing you to drive to a service station for a repair. The S5 doesn’t offer run-flat tires.

Suspension and Handling

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The AMG C-Class Cabriolet’s drift compensation steering can automatically compensate for road conditions which would cause the vehicle to drift from side to side, helping the driver to keep the vehicle straight more easily. The S5 doesn’t offer drift compensation steering.

For a smoother ride and more stable handling, the AMG C-Class Cabriolet’s wheelbase is 2.9 inches longer than on the S5 Cabriolet (111.8 inches vs. 108.9 inches).

For better handling and stability, the average track (width between the wheels) on the AMG C-Class Cabriolet is 1.3 inches wider in the front and .3 inches wider in the rear than the track on the S5.

The AMG C-Class Cabriolet’s front to rear weight distribution is more even (53.5% to 46.5%) than the S5’s (56.7% to 43.3%). This gives the AMG C-Class Cabriolet more stable handling and braking.

Servicing Ease

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J.D. Power and Associates surveys of service recipients show that Mercedes service is better than Audi. J.D. Power ranks Mercedes fifth in service department satisfaction. With a 13% lower rating, Audi is ranked 8th.

Ergonomics

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The AMG C-Class Cabriolet has a standard remote vehicle starting system, so the vehicle can be started from inside the driver's house. This allows the driver to comfortably warm up the engine before going out to the vehicle. The climate system will also automatically heat or cool the interior. The S5 doesn’t offer a remote starting system.

Unlike the driver-only memory system optional at extra cost in the S5, the AMG C-Class Cabriolet has standard driver and 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.

The AMG C-Class Cabriolet’s standard easy entry system raises the steering wheel, making it easier for the driver to get in and out. The S5 doesn’t offer an easy entry system.

The AMG C-Class Cabriolet’s standard power windows have a locking feature to keep children in the rear seat from operating them, but the driver can still raise and lower all of them with the lock engaged. Audi does not offer a locking feature on the S5’s standard power windows.

In case of a sudden change of weather, the AMG C-Class Cabriolet has a standard remote convertible top that can be raised from a distance to protect the interior of the vehicle from damage. The S5 doesn’t offer a remote top, so the driver will have to run to the car, get in, turn the ignition on and raise the top to prevent the interior from being damaged.

To help drivers see further while navigating curves, the AMG C-Class Cabriolet offers optional adaptive headlights to illuminate around corners automatically by reading vehicle speed and steering wheel angle. The S5 doesn’t offer cornering lights.

The AMG C-Class Cabriolet’s optional Active Parking Assist can parallel park or back into a parking spot by itself, starting, stopping and changing direction automatically. The S5 Prestige’s automatic parking system requires operating the brakes and transmission to safely park.

Model Availability

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The AMG C-Class Cabriolet is available in both rear-wheel drive and all-wheel drive configurations. The S5 doesn’t offer a two-wheel drive configuration.

Recommendations

© 1999 - 2020 Advanta-STAR Automotive Research. All rights reserved. This vehicle comparison and all of the content in it are provided only by license from Advanta-STAR Automotive Research Corporation of America. If you are not a legally licensed user of this vehicle comparison, it is against federal law to access it, copy it, forward it or use it in any manner whatsoever. Any unauthorized use of this vehicle comparison is a violation of U.S. and international law and is punishable criminally and civilly. 6IUEX-0KENZ 45.55.47.189 2020/09/28

Consumer Reports® recommends the Mercedes AMG C-Class Cabriolet, based on reliability, safety and performance.

J.D. Power and Associates rated the AMG C-Class Cabriolet first among compact premium cars in owner reported satisfaction. This includes how well the vehicle performs and satisfies its owner’s expectations. The S5 isn’t in the top three.

© 1991-2018 Advanta-STAR Automotive Research. All rights reserved.

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