2020 Mercedes AMG C-Class Sedan vs. 2019 Audi S4

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 2020/02/29

The AMG C-Class Sedan’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 S4 doesn’t offer a driver alert monitor.

Both the AMG C-Class Sedan and the S4 have standard driver and passenger frontal airbags, front side-impact airbags, driver knee airbags, side-impact head airbags, front and rear seatbelt pretensioners, height adjustable front shoulder belts, plastic fuel tanks, 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, around view monitors and rear cross-path warning.

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 Sedan’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 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 43 Sedan’s standard 3.0 turbo V6 produces 36 more horsepower (385 vs. 349) and 15 lbs.-ft. more torque (384 vs. 369) than the S4’s 3.0 turbo V6. The AMG C 63 Sedan’s standard 4.0 turbo V8 produces 120 more horsepower (469 vs. 349) and 110 lbs.-ft. more torque (479 vs. 369) than the S4’s 3.0 turbo V6. The AMG C 63 S Sedan’s standard 4.0 turbo V8 produces 154 more horsepower (503 vs. 349) and 147 lbs.-ft. more torque (516 vs. 369) than the S4’s 3.0 turbo V6.

Fuel Economy and Range

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In heavy traffic or at stoplights the AMG C-Class Sedan’s engine automatically turns off when the vehicle is stopped, saving fuel and reducing pollution. The engine is automatically restarted when the driver gets ready to move again. (Start/Stop isn’t accounted in present EPA fuel mileage tests.) The S4 doesn’t offer an automatic engine start/stop system.

The AMG C-Class Sedan has 2.1 gallons more fuel capacity than the S4 (17.4 vs. 15.3 gallons), for longer range between fill-ups.

Transmission

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A nine-speed automatic (SMG) is standard on the Mercedes AMG C-Class Sedan, for better acceleration and lower engine speed on the highway. Only an eight-speed automatic is available for the S4.

The AMG C-Class Sedan 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 S4 doesn’t offer an SMG or a conventional manual transmission.

Brakes and Stopping

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For better stopping power the AMG C-Class Sedan’s front brake rotors are larger than those on the S4:

AMG C 43 Sedan

AMG C 63 S Sedan

S4

Front Rotors

14.2 inches

15.8 inches

13.8 inches

Rear Rotors

12.6 inches

14.2 inches

13 inches

The AMG C-Class Sedan 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 S4 doesn’t offer ceramic brake rotors.

Tires and Wheels

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Changing a flat tire near traffic can be dangerous and inconvenient. The run-flat tires available on the AMG C-Class Sedan can be driven up to 50 miles without any air pressure, allowing you to drive to a service station for a repair. The S4 doesn’t offer run-flat tires.

Suspension and Handling

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The AMG C-Class Sedan’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 S4 doesn’t offer drift compensation steering.

For better handling and stability, the average track (width between the wheels) on the AMG C-Class Sedan is 1.6 inches wider in the front and .2 inches wider in the rear than the track on the S4.

Chassis

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To almost totally eliminate engine vibration in the passenger area, the AMG C-Class Sedan S has an electronically controlled liquid-filled front engine mount. A computer-controlled electric current in the liquid changes its viscosity, allowing the mount to dampen the engine completely at all RPMs. The S4 uses conventional solid rubber engine mounts.

Passenger Space

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The AMG C-Class Sedan has .4 inches more front legroom and .5 inches more rear shoulder room than the S4.

Cargo Capacity

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To make loading and unloading groceries and cargo easier, especially for short adults, the AMG C-Class Sedan 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 S4 doesn’t offer a power trunk, so its trunk has to be closed manually.

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 Sedan 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 S4 doesn’t offer a remote starting system.

Unlike the driver-only memory seat and mirrors optional at extra cost in the S4, the AMG C-Class Sedan 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 Sedan’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 S4 doesn’t offer an easy entry system.

The S4’s cornering lamps activate a lamp on the front corner when the turn signal is activated. The AMG C-Class Sedan’s optional adaptive cornering lights turn the actual headlight unit up to several degrees, depending on steering wheel angle and vehicle speed. This lights a significant distance into corners at any speed.

A power rear sunshade is optional in the AMG C-Class Sedan to help block heat and glare for the rear passengers. The S4 doesn’t offer a rear sunshade.

When the AMG C-Class Sedan is put in reverse, the passenger rearview mirror tilts from its original position. This gives the driver a better view of the curb during parallel parking maneuvers. Shifting out of reverse puts the mirror into its original position. The S4’s mirror doesn’t automatically adjust for backing.

The AMG C-Class Sedan’s optional Active Parking Assist can parallel park by itself, starting, stopping and changing direction automatically. The S4 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 2020/02/29

The Mercedes AMG C-Class comes in coupe, convertible and sedan bodystyles; the Audi S4 isn’t available as a coupe or convertible.

The AMG C-Class Sedan is available in both rear-wheel drive and all-wheel drive configurations. The S4 doesn’t offer a two-wheel drive configuration.

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