2019 Mercedes AMG GT 4-Door vs. 2018 Audi S8

Detailed Review, Specifications & Comparison

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Safety

Over 200 people are killed each year when backed over by motor vehicles. The AMG GT 4-Door has a standard Rear Cross Traffic Brake that use rear sensors to monitor and automatically apply the brakes to prevent a rear collision. The S8 doesn’t offer backup collision prevention brakes.

To help make backing safer, the AMG GT 4-Door’s 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 S8 doesn’t offer a cross-path warning system.

The AMG GT 4-Door’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 S8 doesn’t offer a driver alert monitor.

The AMG GT 4-Door has standard Mercedes-Benz Emergency Call, which uses a global positioning satellite (GPS) receiver and a cellular system to remotely unlock your doors if you lock your keys in, help track down your vehicle if it’s stolen or send emergency personnel to the scene if any airbags deploy. The S8 doesn’t offer a GPS response system, only a navigation computer with no live response for emergencies, so if you’re involved in an accident and you’re incapacitated help may not come as quickly.

Both the AMG GT 4-Door and the S8 have standard driver and passenger frontal airbags, front side-impact airbags, driver knee airbags, side-impact head airbags, four-wheel antilock brakes, all wheel drive, traction control, electronic stability systems to prevent skidding, daytime running lights, blind spot warning systems, rearview cameras, available lane departure warning systems and around view monitors.

Warranty

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 GT 4-Door’s warranty.

Reliability

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

The AMG GT 63’s standard 4.0 turbo V8 produces 37 lbs.-ft. more torque (590 vs. 553) than the S8’s 4.0 turbo V8. The AMG GT 63 S’ standard 4.0 turbo V8 produces 25 more horsepower (630 vs. 605) and 111 lbs.-ft. more torque (664 vs. 553) than the S8’s 4.0 turbo V8.

Fuel Economy and Range

On the EPA test cycle the AMG GT 53 gets better fuel mileage than the S8 (19 city/24 hwy vs. 14 city/24 hwy).

In heavy traffic or at stoplights the AMG GT 4-Door’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 S8 doesn’t offer an automatic engine start/stop system.

Transmission

A nine-speed automatic is available on the Mercedes AMG GT 4-Door, for better acceleration and lower engine speed on the highway. Only an eight-speed automatic is available for the S8.

Tires and Wheels

For better traction and acceleration, the AMG GT 4-Door has larger standard rear tires than the S8 (285/40R19 vs. 275/35R21). The AMG GT 63 S’ rear tires are larger than the largest rear tires available on the S8 (295/35R20 vs. 275/35R21).

Suspension and Handling

The AMG GT 4-Door’s drift compensation steering can automatically compensate for road conditions that would cause the vehicle to drift from side to side, helping the driver to keep the vehicle straight more easily. The S8 doesn’t offer drift compensation steering.

For better handling and stability, the average track (width between the wheels) on the AMG GT 4-Door is 1.5 inches wider in the front and 1.5 inches wider in the rear than the track on the S8.

Chassis

The AMG GT 4-Door is 3.4 inches shorter than the S8, making the AMG GT 4-Door easier to handle, maneuver and park in tight spaces.

Cargo Capacity

The AMG GT 4-Door’s optional rear seats fold to accommodate long and bulky cargo. The S8 doesn’t offer folding rear seats, only a ski pass-through.

Servicing Ease

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

The AMG GT 4-Door 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 S8 doesn’t offer a remote starting system.

If the windows are left open on the AMG GT 4-Door 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 S8 can’t use the remote to operate the windows.

The AMG GT 4-Door offers an optional 115-volt a/c outlet on the center console, allowing you to recharge a laptop or run small household appliances without special adapters that can break or get misplaced. The S8 doesn’t offer a house-current electrical outlet.

The AMG GT 4-Door’s Active Parking Assist can parallel park by itself, with the driver only controlling speed with the brake pedal. The S8 doesn’t offer an automated parking system.

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

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