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

Detailed Review, Specifications & Comparison

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2020 Mercedes AMG C-Class Cabriolet

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Safety

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Both the 718 Boxster and the AMG C-Class 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, daytime running lights, rearview cameras, available crash mitigating brakes and blind spot warning systems.

Warranty

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The 718 Boxster’s corrosion warranty is 7 years longer than the AMG C-Class Cabriolet’s (12 vs. 5 years).

Reliability

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A reliable vehicle saves its owner time, money and trouble. Nobody wants to be stranded or have to be without a vehicle while it’s being repaired. Consumer Reports rates the 718 Boxster’s reliability 28 points higher than the AMG C-Class Cabriolet.

J.D. Power and Associates’ 2019 survey of the owners of three-year-old vehicles provides the long-term dependability statistics that show that Porsche vehicles are more reliable than Mercedes vehicles. J.D. Power ranks Porsche second in reliability, above the industry average. With 26 more problems per 100 vehicles, Mercedes is ranked 13th.

From surveys of all its subscribers, Consumer Reports’ December 2019 Auto Issue reports that Porsche vehicles are more reliable than Mercedes vehicles. Consumer Reports ranks Porsche fourth in reliability. Mercedes is ranked 21st.

Engine

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As tested in Car and Driver the 718 Boxster S is faster than the AMG C 63 S Cabriolet (automatics tested):

718 Boxster

AMG C-Class

Zero to 60 MPH

3.7 sec

3.9 sec

Quarter Mile

11.9 sec

12.2 sec

The flat cylinder configuration of the boxer engine in the 718 Boxster lowers its center of gravity, enhancing handling stability. The AMG C-Class Cabriolet doesn’t offer a boxer engine configuration.

Fuel Economy and Range

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On the EPA test cycle the 718 Boxster gets better fuel mileage than the AMG C-Class Cabriolet:

MPG

718 Boxster

RWD

Manual

2.0 turbo 4-cyl.

21 city/28 hwy

S 2.5 turbo 4-cyl.

20 city/26 hwy

Auto

2.0 turbo 4-cyl.

22 city/29 hwy

S 2.5 turbo 4-cyl.

21 city/28 hwy

AMG C-Class Cabriolet

RWD

Auto

63 4.0 turbo V8

17 city/24 hwy

63 S 4.0 turbo V8

17 city/24 hwy

AWD

Auto

43 3.0 turbo V6

18 city/25 hwy

An engine control system that can shut down some of the engine’s cylinders helps improve the 718 Boxster Spyder’s fuel efficiency. The AMG C-Class Cabriolet doesn’t offer a system that can shut down part of the engine.

Regenerative brakes improve the 718 Boxster’s fuel efficiency by converting inertia back into energy instead of wasting it. The AMG C-Class Cabriolet doesn’t offer a regenerative braking system.

Brakes and Stopping

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

Spyder

Spyder opt.

AMG C 43

AMG C 63 S

Front Rotors

15 inches

16.1 inches

14.2 inches

15.8 inches

Rear Rotors

15 inches

15.4 inches

12.6 inches

14.2 inches

The 718 Boxster stops much shorter than the AMG C-Class Cabriolet:

718 Boxster

AMG C-Class

70 to 0 MPH

143 feet

155 feet

Car and Driver

Tires and Wheels

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For better traction, the 718 Boxster has larger standard tires than the AMG C-Class Cabriolet (F:235/45R18 & R:265/45R18 vs. F:225/45R18 & R:245/40R18).

For better ride, handling and brake cooling the 718 Boxster offers optional 20-inch wheels. The AMG C-Class Cabriolet’s largest wheels are only 19-inches in the front and 20-inches in the rear.

Suspension and Handling

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The 718 Boxster handles at 1.06 G’s, while the AMG C 63 S Cabriolet pulls only .97 G’s of cornering force in a Car and Driver skidpad test.

For better maneuverability, the 718 Spyder’s turning circle is .9 feet tighter than the AMG C 43 Cabriolet’s (37.5 feet vs. 38.4 feet).

Chassis

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The Porsche 718 Boxster may be more efficient, handle and accelerate better because it weighs about 1050 to 1300 pounds less than the Mercedes AMG C-Class Cabriolet.

The 718 Boxster is 1 foot shorter than the AMG C 43 Cabriolet, making the 718 Boxster easier to handle, maneuver and park in tight spaces.

Passenger Space

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The 718 Boxster has .5 inches more front headroom and 1 inch more front legroom than the AMG C-Class Cabriolet.

Cargo Capacity

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The 718 Boxster has a much larger trunk than the AMG C-Class Cabriolet with its top down (9.7 vs. 7 cubic feet). The 718 Boxster has a larger trunk than the AMG C-Class Cabriolet with its top up (9.7 vs. 8.8 cubic feet).

To make loading groceries and cargo easier when your hands are full, the 718 Boxster’s available trunk can be opened just by holding your hand near the emblem on the trunk, leaving your hands completely free. The AMG C-Class Cabriolet doesn’t offer a hands-free gesture to open its trunk, forcing you to put cargo down if your hands are full.

Servicing Ease

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

Ergonomics

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The 718 Boxster’s instruments include an oil pressure gauge and a temperature gauge - which could save your engine! Often ‘idiot lights’ don’t warn you until damage has been done. The AMG C-Class Cabriolet does not have an oil pressure gauge.

In poor weather, headlights can lose their effectiveness as grime builds up on their lenses. This can reduce visibility without the driver realizing. The 718 Boxster offers available headlight washers to keep headlight output high. The AMG C-Class Cabriolet doesn’t offer headlight washers.

On extremely cold winter days, the 718 Boxster’s optional heated steering wheel provides comfort, allowing the driver to steer safely and comfortably before the car heater warms up. The AMG C-Class Cabriolet doesn’t offer a heated steering wheel.

Economic Advantages

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Insurance will cost less for the 718 Boxster owner. The Complete Car Cost Guide estimates that insurance for the 718 Boxster will cost $7370 to $10225 less than the AMG C-Class Cabriolet over a five-year period.

The 718 Boxster will cost the buyer less in the long run because of its superior resale value. The IntelliChoice estimates that the 718 Boxster will retain 57.09% to 60.51% of its original price after five years, while the AMG C-Class Cabriolet only retains 36.81% to 48.68%.

IntelliChoice estimates that five-year ownership costs (depreciation, financing, insurance, fuel, fees, repairs and maintenance) for the Porsche 718 Boxster will be $21618 to $26610 less than for the Mercedes AMG C-Class Cabriolet.

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 2020/05/28

Consumer Reports® recommends both the Porsche 718 Boxster and the Mercedes AMG C-Class Cabriolet, based on reliability, safety and performance.

The Boxster was chosen as one of Car and Driver’s “Top Ten” for 15 of the last 16 years. The AMG C-Class Cabriolet has never been a Car and Driver “Top Ten” pick.

The 718 Boxster was chosen as one of Automobile Magazine’s “All Stars” for 10 of the last 20 years. The AMG C-Class Cabriolet has never been an “All Star.”

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