2020 BMW M4 vs. 2019 Mercedes AMG C 63 Cabriolet

Detailed Review, Specifications & Comparison

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Safety

Both the M4 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 seatbelt pretensioners, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, rearview cameras, available blind spot warning systems and around view monitors.

Warranty

The M4’s corrosion warranty is 7 years longer than the AMG C 63 Cabriolet’s (12 vs. 5 years).

BMW pays for scheduled maintenance on the M4 for 3 years and 36,000 miles. BMW will pay for oil changes, lubrication and any other required maintenance. Mercedes doesn’t pay scheduled maintenance for the AMG C 63 Cabriolet.

Reliability

J.D. Power and Associates’ 2018 Initial Quality Study of new car owners surveyed provide the statistics that show that BMW vehicles are better in initial quality than Mercedes vehicles. J.D. Power ranks BMW 11th in initial quality, above the industry average. With 5 more problems per 100 vehicles, Mercedes is ranked 15th.

J.D. Power and Associates’ 2019 survey of the owners of three-year-old vehicles provides the long-term dependability statistics that show that BMW vehicles are more reliable than Mercedes vehicles. J.D. Power ranks BMW 7th in reliability, above the industry average. With 12 more problems per 100 vehicles, Mercedes is ranked 13th.

From surveys of all its subscribers, Consumer Reports’ December 2018 Auto Issue reports that BMW vehicles are more reliable than Mercedes vehicles. Consumer Reports ranks BMW 9 places higher in reliability than Mercedes.

Brakes and Stopping

For better stopping power the M4’s standard brake rotors are larger than those on the AMG C 63 Cabriolet:

M4

AMG C 63

Front Rotors

15 inches

14.2 inches

Rear Rotors

14.6 inches

14.2 inches

The M4 stops shorter than the AMG C 63 Cabriolet:

M4

AMG C 63

70 to 0 MPH

151 feet

155 feet

Car and Driver

Tires and Wheels

For better traction, the M4’s optional front tires are larger than the largest tires available on the AMG C 63 Cabriolet (F:265/30R20 & R:285/30R20 vs. F:255/40R18 & R:285/35R18).

The M4’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 M4 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.

Chassis

The BMW M4 may be more efficient, handle and accelerate better because it weighs about 100 to 600 pounds less than the Mercedes AMG C 63 Cabriolet.

The M4’s standard power retractable hardtop allows a seamless transition from an open car, to a completely sealed coupe. The AMG C 63 Cabriolet doesn’t offer a retractable hardtop.

Passenger Space

The M4 Convertible has 8.6 cubic feet more passenger volume than the AMG C 63 Cabriolet (89.9 vs. 81.3).

Cargo Capacity

The M4 Convertible has a larger trunk with its top down than the AMG C 63 Cabriolet with its top down (7.8 vs. 7 cubic feet). The M4 Convertible has a much larger trunk with its top up than the AMG C 63 Cabriolet with its top up (11 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 M4’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.

Ergonomics

Heated windshield washer nozzles are standard on the M4 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.

In poor weather, headlights can lose their effectiveness as grime builds up on their lenses. This can reduce visibility without the driver realizing. The M4 offers available headlight washers to keep headlight output high. The AMG C 63 Cabriolet doesn’t offer headlight washers.

On extremely cold winter days, the M4’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.

Recommendations

The 4 Series was chosen as one of Car and Driver’s “Top Ten” in 2014. The AMG C 63 Cabriolet has never been a Car and Driver “Top Ten” pick.

The M3/M4 was chosen as one of Automobile Magazine’s “All Stars” for 13 of the last 23 years. The AMG C 63 Cabriolet has never been an “All Star.”

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

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