2020 Porsche Cayenne Coupe vs. 2019 Mercedes AMG GLC

Detailed Review, Specifications & Comparison

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Safety

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The Cayenne Coupe has a standard Multi-collision Brake System, which automatically applies the brakes in the event of a crash to help prevent secondary collisions and prevent further injuries. The AMG GLC doesn’t offer a post collision braking system: in the event of a collision that triggers the airbags, more collisions are possible without the protection of airbags that may have already deployed.

When descending a steep, off-road slope, the Cayenne Coupe’s standard Porsche Hill Control allows you to creep down safely. The AMG GLC doesn’t offer Porsche Hill Control.

A passive infrared night vision system optional on the Cayenne Coupe helps the driver to more easily detect people, animals or other objects in front of the vehicle at night. Using an infrared camera to detect heat, the system then displays the image on a monitor in the dashboard. The AMG GLC doesn’t offer a night vision system.

The Cayenne Coupe offers an optional Surround View to allow the driver to see objects all around the vehicle on a screen. The AMG GLC only offers a rear monitor and front and rear parking sensors that beep or flash a light. That doesn’t help with obstacles to the sides.

To help make backing safer, the Cayenne 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 AMG GLC doesn’t offer a cross-path warning system.

Both the Cayenne Coupe and the AMG GLC have standard driver and passenger frontal airbags, front side-impact airbags, driver knee airbags, side-impact head airbags, height adjustable front shoulder belts, four-wheel antilock brakes, all-wheel drive, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, rearview cameras, available lane departure warning systems and blind spot warning systems.

Warranty

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The Cayenne Coupe’s corrosion warranty is 7 years longer than the AMG GLC’s (12 vs. 5 years).

Reliability

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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 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

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The Cayenne Coupe has more powerful engines than the AMG GLC:

Horsepower

Torque

Cayenne S Coupe 2.9 turbo V6

434 HP

406 lbs.-ft.

Cayenne E-Hybrid Coupe 3.0 turbo V6 hybrid

455 HP

516 lbs.-ft.

Cayenne Turbo Coupe 4.0 turbo V8

541 HP

568 lbs.-ft.

Cayenne Turbo S E-Hybrid Coupe 4.0 turbo V8 hybrid

670 HP

663 lbs.-ft.

AMG GLC 43 3.0 turbo V6

362 HP

384 lbs.-ft.

AMG GLC 63 4.0 turbo V8

469 HP

479 lbs.-ft.

Fuel Economy and Range

© 1999 - 2019 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 2019/11/12

The Cayenne Turbo S E-Hybrid Coupe can drive on battery power alone for up to 31 miles. The AMG GLC must run its internal combustion engine to move.

Regenerative brakes improve the Cayenne Coupe’s fuel efficiency by converting inertia back into energy instead of wasting it. The AMG GLC doesn’t offer a regenerative braking system.

The Cayenne Coupe E-Hybrid’s standard fuel tank has 2.4 gallons more fuel capacity than the AMG GLC (19.8 vs. 17.4 gallons), for longer range between fill-ups. The Cayenne Coupe’s standard fuel tank has 6.3 gallons more fuel capacity than the AMG GLC (23.7 vs. 17.4 gallons).

Brakes and Stopping

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For better stopping power the Cayenne Coupe’s brake rotors are larger than those on the AMG GLC:

Cayenne Coupe

AMG GLC 43

AMG GLC 63

Front Rotors

17.3 inches

14.2 inches

15.4 inches

Rear Rotors

16.1 inches

12.6 inches

14.2 inches

The Cayenne Coupe 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 AMG GLC doesn’t offer ceramic brake rotors.

The Cayenne Coupe Turbo has standard air brakes, which adjust the spoiler automatically during high-speed braking in order to shorten stopping distances. The AMG GLC doesn’t offer air brakes.

Tires and Wheels

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For better traction, the Cayenne Coupe has larger standard tires than the AMG GLC (F:275/45R20 & R:305/40R20 vs. F:255/45R20 & R:285/40R20). The Cayenne Coupe’s optional tires are larger than the largest tires available on the AMG GLC (F:285/40R21 & R:315/35R21 vs. F:265/45R20 & R:295/40R20).

The Cayenne Coupe’s optional 285/35R22 front and 315/30R22 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 GLC’s optional 40 series front and 35 series rear tires.

For better ride, handling and brake cooling the Cayenne Coupe offers optional 22-inch wheels. The AMG GLC’s largest wheels are only 21-inches.

The Cayenne Coupe has a standard space-saver spare tire so you can replace a flat tire and drive to have the flat repaired or replaced. A spare tire isn’t available on the AMG GLC; it requires you to depend on its run-flat tires, which limits mileage and speed before they are repaired. If a run-flat is damaged beyond repair by a road hazard your vehicle will have to be towed. Some models of the AMG GLC don’t even offer run-flats.

Suspension and Handling

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The Cayenne Coupe offers active sway bars, which help keep it flat and controlled during cornering, but disconnect at lower speeds to smooth the ride and offer greater off-road suspension articulation. This helps keep the tires glued to the road on-road and off. The AMG GLC doesn’t offer an active sway bar system.

The Cayenne Coupe offers an available adjustable active suspension system, which counteracts cornering forces actively, limiting body roll and improving handling and stability. Mercedes doesn’t offer an active suspension on the AMG GLC.

For greater off-road capability the Cayenne Coupe has a 2.1 inches greater minimum ground clearance than the AMG GLC 63 (8.2 vs. 6.1 inches), allowing the Cayenne Coupe to travel over rougher terrain without being stopped or damaged. The Cayenne Coupe Air Suspension’s minimum ground clearance is 2.9 inches higher than on the AMG GLC 43 (9.6 vs. 6.7 inches).

Cargo Capacity

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The Cayenne Coupe has a much larger cargo volume than the AMG GLC with its rear seat up (22 vs. 17.6 cubic feet).

Towing

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The Cayenne Coupe’s standard towing capacity is much higher than the AMG GLC’s (7700 vs. 3500 pounds).

Servicing Ease

© 1999 - 2019 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 2019/11/12

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

© 1999 - 2019 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 2019/11/12

The Cayenne Coupe’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 GLC 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 Cayenne Coupe offers available headlight washers to keep headlight output high. The AMG GLC doesn’t offer headlight washers.

On extremely cold winter days, the Cayenne Coupe’s optional heated steering wheel provides comfort, allowing the driver to steer safely and comfortably before the vehicle heater warms up. The AMG GLC doesn’t offer a heated steering wheel.

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