2019 Audi S5 vs. 2019 Mercedes AMG C 63 Cabriolet

Detailed Review, Specifications & Comparison

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The S5’s standard pretensioning seatbelts also sense rear collisions and remove slack from the seatbelts to help protect the occupants from whiplash and other injuries. The AMG C 63 Cabriolet doesn’t offer a whiplash protection system.

The S5 has standard Secondary Collision Brake Assist, which automatically apply the brakes in the event of a crash to help prevent secondary collisions and prevent further injuries. The AMG C 63 Cabriolet 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 S5 has all-wheel drive to maximize traction under poor conditions, especially in ice and snow. The AMG C 63 Cabriolet doesn’t offer all-wheel drive.

When descending a steep, off-road slope, the S5’s standard Hill Descent Control allows you to creep down safely. The AMG C 63 Cabriolet doesn’t offer Hill Descent Control.

Both the S5 and the AMG C 63 Cabriolet 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, blind spot warning systems, around view monitors and rear cross-path warning.

For its top level performance in all IIHS frontal, side, rear impact and roof-crush tests, and its standard front crash prevention system, the Insurance Institute for Highway Safety grants the S5 the rating of “Top Pick” for 2017, a rating granted to only 154 vehicles tested by the IIHS. The AMG C 63 Cabriolet has not been tested, yet.


The S5’s corrosion warranty is 7 years longer than the AMG C 63 Cabriolet’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.

Fuel Economy and Range

On the EPA test cycle the S5 Cabriolet gets better fuel mileage than the AMG C 63 Cabriolet (21 city/29 hwy vs. 17 city/24 hwy).

Regenerative brakes improve the S5’s fuel efficiency by converting inertia back into energy instead of wasting it. The AMG C 63 Cabriolet doesn’t offer a regenerative braking system.


All wheel drive, available in the S5, provides the best traction for acceleration in wet, dry, and icy conditions. In corners, all wheel drive allows both outside wheels to provide power, balancing the car. This allows for better handling. The Mercedes AMG C 63 Cabriolet is not available with all wheel drive.

Brakes and Stopping

The S5 stops shorter than the AMG C 63 Cabriolet:



AMG C 63


70 to 0 MPH

150 feet

155 feet

Car and Driver

Tires and Wheels

For better traction, the S5’s optional tires are larger than the largest tires available on the AMG C 63 Cabriolet (265/30R20 vs. 255/40R18).

The S5’s optional tires provide better handling because they have a lower 30 series profile (height to width ratio) that provides a stiffer sidewall than the AMG C 63 Cabriolet’s optional 35 series front tires.

For better ride, handling and brake cooling the S5 offers optional 20-inch wheels. The AMG C 63 Cabriolet’s largest wheels are only 19-inches in the front and 20-inches in the rear.


The Audi S5 may be more efficient, handle and accelerate better because it weighs about 50 to 400 pounds less than the Mercedes AMG C 63 Cabriolet.

Passenger Space

The S5 Coupe has 2.7 cubic feet more passenger volume than the AMG C 63 Cabriolet (84 vs. 81.3).

Cargo Capacity

The S5 Cabriolet has a larger trunk with its top up than the AMG C 63 Cabriolet with its top up (9.3 vs. 8.8 cubic feet).

To make loading groceries and cargo easier when your hands are full, just kicking your foot under the back bumper can open the S5’s trunk, leaving your hands completely free. The AMG C 63 Cabriolet doesn’t offer a hands-free gesture to open its trunk, forcing you to put cargo down if your hands are full.

Servicing Ease

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.


Heated windshield washer nozzles are standard on the S5 to prevent washer fluid and nozzles from freezing and help continue to keep the windshield clear in sub-freezing temperatures. The AMG C 63 Cabriolet doesn’t offer heated windshield washer nozzles.

On extremely cold winter days, the S5’s optional heated steering wheel provides comfort, allowing the driver to steer safely and comfortably before the car heater warms up. The AMG C 63 Cabriolet doesn’t offer a heated steering wheel.

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

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