2020 Mercedes AMG C-Class Cabriolet vs. 2020 BMW 8 Series

Detailed Review, Specifications & Comparison

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Safety

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For enhanced safety, the front and rear seat shoulder belts of the Mercedes AMG C-Class Cabriolet have pretensioners to tighten the seatbelts and eliminate dangerous slack in the event of a collision and force limiters to limit the pressure the belts will exert on the passengers. The BMW 8 Series doesn’t offer pretensioners for the rear seat belts.

Both the AMG C-Class Cabriolet and the 8 Series have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee airbags, side-impact head airbags, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, rearview cameras, driver alert monitors, available lane departure warning systems, around view monitors and rear cross-path warning.

Warranty

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There are over 10 percent more Mercedes dealers than there are BMW 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 BMW vehicles. J.D. Power ranks Mercedes 12th in initial quality. With 8 more problems per 100 vehicles, BMW is ranked 20th.

Engine

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The AMG C-Class Cabriolet has more powerful engines than the 8 Series:

Horsepower

Torque

AMG C 43 Cabriolet 3.0 turbo V6

385 HP

384 lbs.-ft.

AMG C 63 Cabriolet 4.0 turbo V8

469 HP

479 lbs.-ft.

AMG C 63 S Cabriolet 4.0 turbo V8

503 HP

516 lbs.-ft.

840i 3.0 turbo 6-cylinder

335 HP

368 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 BMW 8 Series (3). This means the AMG C-Class Cabriolet produces up to 16.5 pounds less smog-producing pollutants than the 8 Series 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 an eight-speed automatic is available for the 8 Series.

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 8 Series doesn’t offer an SMG or a conventional manual transmission.

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 8 Series:

AMG C 63 S Cabriolet

8 Series

Front Rotors

15.8 inches

15.6 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 8 Series doesn’t offer ceramic brake rotors.

The AMG C-Class Cabriolet stops shorter than the 8 Series:

AMG C-Class Cabriolet

8 Series

70 to 0 MPH

155 feet

161 feet

Car and Driver

Tires and Wheels

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For better traction, the AMG C 63 Cabriolet’s tires are larger than the largest tires available on the 8 Series (F:255/40R18 & R:285/35R18 vs. F:245/35R20 & R:275/30R20).

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 8 Series doesn’t offer drift compensation steering.

Chassis

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The AMG C 43 Cabriolet is 6.4 inches shorter than the 8 Series, making the AMG C-Class Cabriolet easier to handle, maneuver and park in tight spaces.

Servicing Ease

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J.D. Power and Associates surveys of service recipients show that Mercedes service is better than BMW. J.D. Power ranks Mercedes fifth in service department satisfaction. With a 23% lower rating, BMW is ranked 11th.

Ergonomics

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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. BMW does not offer a locking feature on the 8 Series’ 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 8 Series 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 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 8 Series doesn’t offer extendable visors.

Economic Advantages

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IntelliChoice estimates that five-year ownership costs (depreciation, financing, insurance, fuel, fees, repairs and maintenance) for the Mercedes AMG C-Class Cabriolet will be $28077 to $38775 less than for the BMW 8 Series.

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 2020/03/30

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 8 Series isn’t in the top three.

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

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