2020 Mercedes AMG C-Class Cabriolet vs. 2020 Porsche 718 Boxster

Detailed Review, Specifications & Comparison

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2020 Mercedes AMG C-Class Cabriolet

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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 2020/04/05

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 718 Boxster doesn’t offer pre-crash pretensioners.

The AMG C-Class Cabriolet’s standard pretensioning seatbelts also sense rear collisions and remove slack from the seatbelts to help protect the occupants from whiplash and other injuries. The 718 Boxster doesn’t offer a whiplash protection system.

The AMG C 43 Cabriolet has all-wheel drive to maximize traction under poor conditions, especially in ice and snow. The 718 Boxster doesn’t offer all-wheel drive.

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 718 Boxster 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 718 Boxster only offers a rear monitor and front and rear parking sensors that beep. That doesn’t help with obstacles to the sides.

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 718 Boxster 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 718 Boxster doesn’t offer a driver alert monitor.

Both the AMG C-Class Cabriolet and the 718 Boxster 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 1025 to 1331 pounds more than the Porsche 718 Boxster. The NHTSA advises that heavier cars are much safer in collisions than their significantly lighter counterparts.

Warranty

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There are over 2 times as many Mercedes dealers as there are Porsche dealers, which makes it much 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 Porsche vehicles. J.D. Power ranks Mercedes 12th in initial quality. With 2 more problems per 100 vehicles, Porsche is ranked 15th.

Engine

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The AMG C-Class Cabriolet has more powerful engines than the 718 Boxster:

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.

718 Boxster 2.0 turbo 4-cylinder

300 HP

280 lbs.-ft.

718 Boxster S 2.5 turbo 4-cylinder

350 HP

309 lbs.-ft.

718 Boxster GTS 2.5 turbo 4-cylinder

365 HP

309 lbs.-ft.

718 Boxster GTS 2.5 turbo 4-cylinder

365 HP

317 lbs.-ft.

718 Spyder 4.0 GT3 6-cylinder

414 HP

309 lbs.-ft.

As tested in Car and Driver the AMG C 63 S Cabriolet 4.0 turbo V8 is faster than the Porsche 718 Boxster turbo 4 cyl. (automatics tested):

AMG C-Class Cabriolet

718 Boxster

Zero to 60 MPH

3.9 sec

4 sec

Zero to 80 MPH

5.9 sec

6.5 sec

Zero to 100 MPH

8.7 sec

9.9 sec

5 to 60 MPH Rolling Start

4.3 sec

5 sec

Passing 30 to 50 MPH

1.7 sec

4.4 sec

Passing 50 to 70 MPH

2.3 sec

3.5 sec

Quarter Mile

12.2 sec

12.5 sec

Speed in 1/4 Mile

119 MPH

112 MPH

Fuel Economy and Range

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The AMG C-Class Cabriolet has 3.2 gallons more fuel capacity than the 718 Boxster’s standard fuel tank (17.4 vs. 14.2 gallons), for longer range between fill-ups.

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 Porsche 718 Boxster (3). This means the AMG C-Class Cabriolet produces up to 16.5 pounds less smog-producing pollutants than the 718 Boxster every 15,000 miles.

Transmission and Drivetrain

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The Mercedes AMG C-Class Cabriolet comes standard with an automatic transmission, for driver comfort, especially in the city. Automatic costs extra on the 718 Boxster.

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 718 Boxster.

All wheel drive, available in the AMG C-Class Cabriolet, 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 Porsche 718 Boxster is not available with all wheel drive.

Brakes and Stopping

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For better stopping power the AMG C-Class Cabriolet’s standard brake rotors are larger than those on the 718 Boxster:

AMG C-Class Cabriolet

718 Boxster

Front Rotors

14.2 inches

13 inches

Rear Rotors

12.6 inches

11.8 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 718 Boxster (255/40R18 vs. 245/35R20).

The AMG C 43 Cabriolet’s standard 245/40R18 rear tires provide better handling because they have a lower 40 series profile (height to width ratio) that provides a stiffer sidewall than the 718 Boxster’s standard 45 series tires.

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 718 Boxster 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 718 Boxster doesn’t offer drift compensation steering.

For a smoother ride and more stable handling, the AMG C-Class Cabriolet’s wheelbase is 14.4 inches longer than on the 718 Boxster (111.8 inches vs. 97.4 inches).

For better handling and stability, the average track (width between the wheels) on the AMG C-Class Cabriolet is 3.8 inches wider in the front and 1.6 inches wider in the rear than the average track on the 718 Boxster.

Chassis

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As tested by Car and Driver, the interior of the AMG C 63 S Cabriolet is quieter than the 718 Boxster S:

AMG C-Class Cabriolet

718 Boxster

At idle

48 dB

54 dB

Full-Throttle

78 dB

88 dB

70 MPH Cruising

70 dB

75 dB

Passenger Space

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The AMG C-Class Cabriolet has standard seating for 4 passengers; the 718 Boxster can only carry 2.

The AMG C-Class Cabriolet has 32.3 cubic feet more passenger volume than the 718 Boxster (81.3 vs. 49).

Cargo Capacity

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With its convertible body style, locking rear seatbacks and remote trunk release lockout, the AMG C-Class offers cargo security. The 718 Boxster’s non-lockable remote release defeats cargo security.

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 718 Boxster doesn’t offer a remote starting system.

Unlike the driver-only memory system optional at extra cost in the 718 Boxster, 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’s standard easy entry system raises the steering wheel, making it easier for the driver to get in and out. An easy entry system costs extra on the 718 Boxster.

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 718 Boxster 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. Porsche does not offer a locking feature on the 718 Boxster’s standard power windows.

If the windows are left open on the AMG C-Class Cabriolet the driver can close them all at the outside door handle or from a distance using the remote. On a hot day the driver can lower the windows from a distance using the keyless remote. The driver of the 718 Boxster can only operate the windows from inside the vehicle, with the ignition on.

The AMG C-Class Cabriolet’s rain-sensitive wipers adjust their speed and turn on and off automatically based on the amount of rainfall on the windshield. This allows the driver to concentrate on driving without constantly adjusting the wipers. The 718 Boxster’s standard manually variable intermittent wipers have to be constantly adjusted.

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 718 Boxster 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 718 Boxster’s visors are fixed into the windshield header.

The AMG C-Class Cabriolet has a standard dual zone air conditioning allows the driver and front passenger to choose two completely different temperatures so people with different temperature preferences won’t have to compromise. This makes both the driver and front passenger as comfortable as possible. Dual zone air conditioning costs extra on the 718 Boxster.

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 718 Boxster doesn’t offer an automated parking system.

Model Availability

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The Mercedes AMG C-Class comes in coupe, convertible and sedan bodystyles; the Porsche 718 isn’t available as a sedan.

Recommendations

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Consumer Reports® recommends both the Mercedes AMG C-Class Cabriolet and the Porsche 718 Boxster, 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 718 Boxster isn’t in the top three.

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

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