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For enhanced safety, the front and rear seat shoulder belts of the Mercedes AMG C-Class Coupe 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 M4 doesn’t offer pretensioners for the rear seat belts.
The AMG C-Class Coupe’s pre-crash front seatbelts will tighten automatically in the event the vehicle detects an impending crash, improving protection against injury significantly. The M4 doesn’t offer pre-crash pretensioners.
Using vehicle speed sensors, smart airbags in the AMG C-Class Coupe deploy with different levels of force or don’t deploy at all to help better protect passengers of all sizes in different collisions. The AMG C-Class Coupe’s side airbags will shut off if a child is leaning against the door. The M4’s airbags don’t have smart features and will always deploy full force.
The AMG C 43 Coupe has all-wheel drive to maximize traction under poor conditions, especially in ice and snow. The M4 doesn’t offer all-wheel drive.
To help make backing safer, the AMG C-Class Coupe’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 M4 doesn’t offer a cross-path warning system.
The AMG C-Class Coupe’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 M4 doesn’t offer a driver alert monitor.
Both the AMG C-Class Coupe and the M4 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, available lane departure warning systems and around view monitors.
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 Coupe’s warranty.
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.
The AMG C-Class Coupe has more powerful engines than the M4:
AMG C 63 Coupe 4.0 turbo V8
AMG C 63 S Coupe 4.0 turbo V8
M4 3.0 turbo 6-cylinder
M4 3.0 turbo 6-cylinder
M4 CS Coupe 3.0 turbo 6-cylinder
The AMG C-Class Coupe has 1.6 gallons more fuel capacity than the M4 (17.4 vs. 15.8 gallons), for longer range between fill-ups.
In its Green Vehicle Guide, the U.S. Environmental Protection Agency (EPA) rates the Mercedes AMG C-Class Coupe higher (5 out of 10) than the BMW M4 (3). This means the AMG C-Class Coupe produces up to 16.5 pounds less smog-producing pollutants than the M4 every 15,000 miles.
The Mercedes AMG C-Class Coupe comes standard with an automatic transmission, for driver comfort, especially in the city. Automatic costs extra on the M4.
A nine-speed automatic (SMG) is standard on the Mercedes AMG C-Class Coupe, for better acceleration and lower engine speed on the highway. Only a seven-speed automatic is available for the M4.
To facilitate fast shifting and allow the driver to focus on the road, the AMG C-Class Coupe has a standard up-shift light to indicate when the engine is approaching redline. The M4 doesn’t offer an up-shift light.
All-wheel drive, available in the AMG C-Class Coupe, 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 BMW M4 is not available with all-wheel drive.
Changing a flat tire near traffic can be dangerous and inconvenient. The run-flat tires available on the AMG C-Class Coupe can be driven up to 50 miles without any air pressure, allowing you to drive to a service station for a repair. The M4 doesn’t offer run-flat tires.
The AMG C-Class Coupe’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 M4 doesn’t offer drift compensation steering.
For a smoother ride and more stable handling, the AMG C-Class Coupe’s wheelbase is 1.1 inches longer than on the M4 (111.8 inches vs. 110.7 inches).
For better handling and stability, the average track (width between the wheels) on the AMG C-Class Coupe is 1.5 inches wider in the front than the track on the M4.
For better maneuverability, the AMG C 63 Coupe’s turning circle is 2.9 feet tighter than the M4’s (37.1 feet vs. 40 feet). The AMG C 43 Coupe’s turning circle is 1.6 feet tighter than the M4’s (38.4 feet vs. 40 feet).
The AMG C-Class Coupe’s standard folding rear seats are split to accommodate bulky cargo. The M4 Convertible’s standard single piece folding rear seat is not as flexible; long cargo and a passenger can’t share the rear seat.
To make loading and unloading groceries and cargo easier, especially for short adults, the AMG C-Class Coupe has a standard power trunk, which opens and closes automatically by pressing a button or just by kicking your foot under the back bumper, completely leaving your hands free. The M4 doesn’t offer a power trunk, so its trunk has to be closed manually.
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.
The AMG C-Class Coupe 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 M4 doesn’t offer a remote starting system.
Unlike the driver-only memory system in the M4, the AMG C-Class Coupe 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 Coupe’s standard easy entry system raises the steering wheel and glides the driver’s seat back, making it easier for the driver to get in and out. The M4 doesn’t offer an easy entry system.
The AMG C-Class Coupe’s power parking brake sets with one touch and releases with one touch or automatically. The M4 has a lever-type parking brake that has to be strenuously raised to engage properly. It has to be lifted up more and a button depressed to release it.
To shield the driver and front passenger’s vision over a larger portion of the windshield and side windows, the AMG C-Class Coupe has standard extendable sun visors. The M4 doesn’t offer extendable visors.
Optional air-conditioned seats in the AMG C-Class Coupe keep the driver and front passenger comfortable and take the sting out of hot seats in summer. The M4 doesn’t offer air-conditioned seats.
The AMG C-Class Coupe has a standard center folding armrest for the rear passengers. A center armrest helps make rear passengers more comfortable. The M4 doesn’t offer a rear seat center armrest.
To keep a safe, consistent following distance, the AMG C-Class Coupe 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 M4 doesn’t offer an adaptive cruise control.
The AMG C-Class Coupe’s optional Active Parking Assist can parallel park or back into a parking spot by itself, starting, stopping and changing direction automatically. The M4’s automatic parking system requires operating the brakes and transmission to safely park.
The Mercedes AMG C-Class comes in coupe, convertible and sedan bodystyles; the BMW M4 isn’t available as a sedan.
Consumer Reports® recommends the Mercedes AMG C-Class Coupe, based on reliability, safety and performance.
J.D. Power and Associates rated the AMG C-Class Coupe first among compact premium cars in owner reported satisfaction. This includes how well the vehicle performs and satisfies its owner’s expectations. The M4 isn’t in the top three.
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