2019 Porsche 718 Boxster vs. 2019 Mercedes C-Class Cabriolet

Detailed Review, Specifications & Comparison

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2019 Mercedes C-Class Cabriolet

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Safety

Both the 718 Boxster and the 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

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

Reliability

J.D. Power and Associates’ 2018 Initial Quality Study of new car owners surveyed provide the statistics that show that Porsche vehicles are better in initial quality than Mercedes vehicles. J.D. Power ranks Porsche fourth in initial quality, above the industry average. With 13 more problems per 100 vehicles, Mercedes is ranked 14th.

J.D. Power and Associates’ 2018 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 47 more problems per 100 vehicles, Mercedes is ranked 15th.

From surveys of all its subscribers, Consumer Reports’ December 2018 Auto Issue reports that Porsche vehicles are more reliable than Mercedes vehicles. Consumer Reports ranks Porsche 6 places higher in reliability than Mercedes.

Engine

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

 

Horsepower

Torque

718 Boxster 2.0 turbo 4 cyl.

300 HP

280 lbs.-ft.

718 Boxster S 2.5 turbo 4 cyl.

350 HP

309 lbs.-ft.

718 Boxster GTS 2.5 turbo 4 cyl.

365 HP

309 lbs.-ft.

718 Boxster GTS 2.5 turbo 4 cyl.

365 HP

317 lbs.-ft.

C 300 Cabriolet 2.0 turbo 4 cyl.

255 HP

273 lbs.-ft.

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

Fuel Economy and Range

On the EPA test cycle the 718 Boxster Auto with its standard engine gets better fuel mileage than the C 300 Cabriolet RWD (22 city/29 hwy vs. 21 city/29 hwy).

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

Transmission

The 718 Boxster offers a manual transmission for better acceleration, control and fuel economy. The C-Class Cabriolet doesn’t offer a manual transmission.

The 718 Boxster offers an optional 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 C-Class Cabriolet doesn’t offer an SMG.

The 718 Boxster PDK’s optional launch control uses engine electronics to hold engine RPM’s precisely in order to provide the most stable and rapid acceleration possible, using all of the available traction. The C-Class Cabriolet doesn’t offer launch control.

Brakes and Stopping

The 718 Boxster 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 C-Class Cabriolet doesn’t offer ceramic brake rotors.

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

 

718 Boxster

C-Class Cabriolet

 

70 to 0 MPH

143 feet

158 feet

Car and Driver

Tires and Wheels

For better traction, the 718 Boxster has larger standard tires than the C-Class Cabriolet (F:235/45R18 & R:265/45R18 vs. F:225/45R18 & R:245/40R18). The 718 Boxster’s optional tires are larger than the largest tires available on the C-Class Cabriolet (F:245/35R20 & R:305/30R20 vs. F:225/45R18 & R:245/40R18).

The 718 Boxster’s optional 245/35R20 front and 305/30R20 rear tires provide better handling because they have a lower 35 series front and 30 series rear profile (height to width ratio) that provides a stiffer sidewall than the AMG C 43 Cabriolet’s optional 40 series front and 35 series rear tires.

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

Suspension and Handling

The 718 Boxster S handles at 1.04 G’s, while the C 300 Cabriolet pulls only .94 G’s of cornering force in a Car and Driver skidpad test.

For better maneuverability, the 718 Boxster’s turning circle is .7 feet tighter than the C 300 Cabriolet’s (36.1 feet vs. 36.8 feet). The 718 Boxster’s turning circle is 3.6 feet tighter than the AMG C 43 Cabriolet’s (36.1 feet vs. 39.7 feet).

Chassis

The Porsche 718 Boxster may be more efficient, handle and accelerate better because it weighs about 900 to 1100 pounds less than the Mercedes 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.

To almost totally eliminate engine vibration in the passenger area, the 718 Boxster has liquid-filled engine mounts. The liquid helps further dampen engine harshness. The C-Class Cabriolet uses conventional solid rubber engine mounts.

Passenger Space

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

Cargo Capacity

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

J.D. Power and Associates surveys of service recipients show that Porsche service is better than Mercedes. J.D. Power ranks Porsche second in service department satisfaction. With a 6% lower rating, Mercedes is ranked 6th.

Ergonomics

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 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 C-Class Cabriolet doesn’t offer headlight washers.

Recommendations

Consumer Reports® recommends the Porsche 718 Boxster, based on reliability, safety and performance.

The Boxster was chosen as one of Car and Driver’s “Top Ten” for 14 of the last 14 years. The 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 19 years. The C-Class Cabriolet has never been an “All Star.”

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

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