2019 Audi S5 vs. 2019 Mercedes C-Class Cabriolet

Detailed Review, Specifications & Comparison

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Safety

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 C-Class 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 C-Class 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.

To provide maximum traction and stability on all roads, All-Wheel Drive is standard on the S5. But it costs extra on the C-Class Cabriolet.

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

Both the S5 and the C-Class 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 139 vehicles tested by the IIHS. The C-Class Cabriolet has not been tested, yet.

Warranty

The S5’s corrosion warranty is 7 years longer than the C-Class Cabriolet’s (12 vs. 5 years).

Reliability

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.

Engine

The S5’s 3.0 turbo V6 produces 94 more horsepower (349 vs. 255) and 96 lbs.-ft. more torque (369 vs. 273) than the C 300 Cabriolet’s standard 2.0 turbo 4 cyl.

Fuel Economy and Range

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

Brakes and Stopping

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

 

S5

C-Class Cabriolet

Front Rotors

13.8 inches

13 inches

Rear Rotors

13 inches

11.8 inches

The S5 stops shorter than the C-Class Cabriolet:

 

S5

C-Class Cabriolet

 

70 to 0 MPH

150 feet

158 feet

Car and Driver

Tires and Wheels

For better traction, the S5 has larger standard tires than the C-Class Cabriolet (245/40R18 vs. 225/45R18). The S5’s optional tires are larger than the largest tires available on the C-Class Cabriolet (265/30R20 vs. 225/45R18).

The S5’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 C-Class Cabriolet’s standard 45 series front tires. The S5’s optional tires have a lower 30 series profile than the AMG C 43 Cabriolet’s optional 40 series front and 35 series rear tires.

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

Passenger Space

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

Cargo Capacity

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

To make loading groceries and cargo easier when your hands are full, the S5’s trunk can be opened just by kicking your foot under the back bumper, leaving your hands completely free. The C-Class 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.

Ergonomics

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 C-Class Cabriolet doesn’t offer heated windshield washer nozzles.

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

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