2020 Mercedes AMG C-Class Cabriolet vs. 2020 Audi R8

Detailed Review, Specifications & Comparison

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Safety

© 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 2020/02/23

The AMG C-Class Cabriolet’s pre-crash front seatbelts will tighten automatically in the event the vehicle detects an impending crash, improving protection against injury significantly. The R8 doesn’t offer pre-crash pretensioners.

The AMG C-Class Cabriolet has a standard Active Brake Assist, which uses forward mounted sensors to warn the driver of a possible collision ahead. If the driver doesn’t react and the system determines a collision is imminent, it automatically applies the brakes at full-force in order to reduce the force of the crash or avoid it altogether. The R8 doesn't offer collision warning or crash mitigation brakes.

The AMG C-Class Cabriolet’s optional lane departure warning system alerts a temporarily inattentive driver when the vehicle begins to leave its lane and gently nudges the vehicle back towards its lane. The R8 doesn’t offer a lane departure warning system.

The AMG C-Class Cabriolet offers an optional Surround View System to allow the driver to see objects all around the vehicle on a screen. The R8 only offers a rear monitor and front and rear parking sensors that beep or flash a light. That doesn’t help with obstacles to the sides.

The AMG C-Class Cabriolet’s blind spot warning system uses digital cameras monitored by computer to alert the driver to moving objects in the vehicle’s blind spots where the side view mirrors don’t reveal them. The R8 doesn’t offer a system to reveal objects in the driver’s blind spots.

To help make backing safer, the AMG C-Class Cabriolet’s optional cross-path warning system uses wide-angle radar in the rear bumper to alert the driver to vehicles approaching from the side, helping the driver avoid collisions. The R8 doesn’t offer a cross-path warning system.

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 R8 doesn’t offer a driver alert monitor.

Both the AMG C-Class Cabriolet and the R8 have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee airbags, side-impact head airbags, front seatbelt pretensioners, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, daytime running lights and rearview cameras.

The Mercedes AMG C-Class Cabriolet weighs 571 to 759 pounds more than the Audi R8. The NHTSA advises that heavier cars are much safer in collisions than their significantly lighter counterparts.

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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The R8’s redline is at 8700 RPM, which causes more engine wear, and a greater chance of a catastrophic engine failure. The AMG C-Class Cabriolet has a 6550 to 7000 RPM redline.

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-Class Cabriolet has more powerful engines than the R8:

Torque

AMG C 63 Cabriolet 4.0 turbo V8

479 lbs.-ft.

AMG C 63 S Cabriolet 4.0 turbo V8

516 lbs.-ft.

R8 V10 5.2 DOHC V10

406 lbs.-ft.

R8 V10 Performance/Decennium 5.2 DOHC V10

413 lbs.-ft.

Environmental Friendliness

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In its Green Vehicle Guide, the U.S. Environmental Protection Agency (EPA) rates the Mercedes AMG C-Class Cabriolet higher (5 out of 10) than the Audi R8 (1). This means the AMG C-Class Cabriolet produces up to 39 pounds less smog-producing pollutants than the R8 every 15,000 miles.

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 a seven-speed automatic is available for the R8.

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 R8 doesn’t offer launch control.

Brakes and Stopping

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For better stopping power the AMG C 63 S Cabriolet’s front brake rotors are larger than those on the R8:

AMG C 63 S Cabriolet

R8

R8

Front Rotors

15.8 inches

14.4 inches

15 inches

Rear Rotors

14.2 inches

14 inches

14 inches

Tires and Wheels

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For better traction, the AMG C 63 Cabriolet’s front tires are larger than the largest tires available on the R8 (255/40R18 vs. 245/30R20).

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 R8 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 R8 doesn’t offer drift compensation steering.

For a smoother ride and more stable handling, the AMG C-Class Cabriolet’s wheelbase is 7.5 inches longer than on the R8 (111.8 inches vs. 104.3 inches).

Passenger Space

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The AMG C-Class Cabriolet has standard seating for 4 passengers; the R8 can only carry 2.

The AMG C-Class Cabriolet has 31.3 cubic feet more passenger volume than the R8 (81.3 vs. 50).

The AMG C-Class Cabriolet has .3 inches more front headroom and 1.1 inches more front legroom than the R8.

Cargo Capacity

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The AMG C-Class Cabriolet has a much larger trunk with its top down than the R8 Spyder (7 vs. 4 cubic feet).

With its convertible body style, locking rear seatbacks and remote trunk release lockout, the AMG C-Class offers cargo security. The R8’s non-lockable remote release defeats cargo security.

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 R8 doesn’t offer a remote starting system.

Unlike the driver-only memory system in the R8, 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 offers an optional heads-up display that projects speed and other key instrumentation readouts in front of the driver’s line of sight, allowing drivers to view information without diverting their eyes from the road. The R8 doesn’t offer a heads-up display.

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 R8’s standard power windows.

To shield the driver and front passenger’s vision over a larger portion of the windshield and side windows, the AMG C-Class Cabriolet has standard extendable sun visors. The R8 doesn’t offer extendable visors.

The AMG C-Class Cabriolet’s sun-visors swivel front-to-side to block glare from the side windows. The R8’s visors are fixed into the windshield header.

Optional air-conditioned seats in the AMG C-Class Cabriolet keep the driver and front passenger comfortable and take the sting out of hot seats in summer. The R8 doesn’t offer air-conditioned seats.

To keep a safe, consistent following distance, the AMG C-Class Cabriolet offers an optional Active Distance Assist Distronic, which alters the speed of the vehicle without driver intervention. This allows the driver to use cruise control more safely without constantly having to disengage it when approaching slower traffic. The R8 doesn’t offer an adaptive cruise control.

To quickly and conveniently keep personal devices charged without cables tangling and wearing out, the Mercedes AMG C-Class offers an optional wireless phone charging system (Qi) in the center console. The R8 doesn’t offer wireless personal charging.

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 R8 doesn’t offer an automated parking system.

Model Availability

© 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 2020/02/23

The Mercedes AMG C-Class comes in coupe, convertible and sedan bodystyles; the Audi R8 isn’t available as a sedan.

The AMG C-Class Cabriolet is available in both rear-wheel drive and all-wheel drive configurations. The R8 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 2020/02/23

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

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

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