Compare the2025 Audi S8VS 2025 BMW 8 Series Gran Coupe

For enhanced safety, the front and rear seat shoulder belts of the Audi S8 have pretensioners to tighten the seatbelts and eliminate dangerous slack in the event of a collision and force limiters to limit the pressure the belts will exert on the passengers. The BMW 8 Series Gran Coupe doesn’t offer pretensioners for its rear seat belts.

For enhanced safety, the front seat shoulder belts of the Audi S8 are height-adjustable to accommodate a wide variety of driver and passenger heights. A better fit can prevent injuries and the increased comfort also encourages passengers to buckle up. The BMW 8 Series Gran Coupe doesn’t offer height-adjustable seat belts.

Both the S8 and 8 Series Gran Coupe have child safety locks to prevent children from opening the rear doors. The S8 has power child safety locks, allowing the driver to activate and deactivate them from the driver's seat and to know when they're engaged. The 8 Series Gran Coupe’s child locks have to be individually engaged at each rear door with a manual switch. The driver can’t know the status of the locks without opening the doors and checking them.

The S8 has a standard front seat center airbag, which deploys between the driver and front passenger, protecting them from injuries caused by striking each other in serious side impacts. The 8 Series Gran Coupe doesn’t offer front seat center airbags.

To provide maximum traction and stability on all roads, All-Wheel Drive is standard on the S8. But it costs extra on the 8 Series Gran Coupe.

Earlier warning of stopped traffic, traffic signals, dangerous road conditions, weather, or accidents, can keep driver's safer and prevent crashes. The S8 has Car-to-X Services, a system that seamlessly communicates important warnings to the driver about impending danger, if they're available. The 8 Series Gran Coupe doesn’t offer a system that can receive automated systems from infrastructure.

A passive infrared night vision system optional on the S8 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 and even aims one of the vehicle’s headlights in the direction of the person or object. The 8 Series Gran Coupe doesn’t offer a night vision system.

Both the S8 and 8 Series Gran Coupe offer rear cross-traffic warning, but the S8 with Rear Cross-Traffic Assist also has Automatic Brake Activation (automatically applies the brakes) to better prevent a collision when backing near traffic. The 8 Series Gran Coupe’s Cross Traffic Warning doesn’t automatically brake.

Both the S8 and the 8 Series Gran Coupe have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee airbags, side-impact head airbags, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, post-collision automatic braking systems, daytime running lights, lane departure warning systems, rearview cameras and available blind spot warning systems.

The S8’s 4.0 turbo V8 hybrid produces 228 more horsepower (563 vs. 335) and 221 lbs.-ft. more torque (590 vs. 369) than the 840i Gran Coupe’s standard 3.0 turbo 6-cylinder. The S8’s 4.0 turbo V8 hybrid produces 40 more horsepower (563 vs. 523) and 37 lbs.-ft. more torque (590 vs. 553) than the M850i Gran Coupe’s standard 4.4 turbo V8.

As tested in Motor Trend the Audi S8 is faster than the 840i Gran Coupe 3.0 turbo 6-cylinder:

The S8 has 3.7 gallons more fuel capacity than the 8 Series Gran Coupe (21.7 vs. 18 gallons), for longer range between fill-ups.

For better stopping power the S8’s front brake rotors are larger than those on the 8 Series Gran Coupe:

The S8 stops shorter than the 8 Series Gran Coupe:

For better traction, the S8 has larger tires than the 8 Series Gran Coupe (265/35R21 vs. 245/40R19). The S8’s tires are larger than the largest tires available on the 8 Series Gran Coupe (265/35R21 vs. 245/35R21).

The S8’s tires provide better handling because they have a lower 35 series profile (height to width ratio) that provides a stiffer sidewall than the 840i Gran Coupe’s standard 40 series front tires.

For better ride, handling and brake cooling the S8 has standard 21-inch wheels. Smaller 19-inch wheels are standard on the 840i Gran Coupe.

The S8 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 8 Series Gran Coupe; 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 tire options on the 8 Series Gran Coupe don’t have a run-flat feature, either.

The front and rear suspension of the S8 uses air springs for a smoother, controlled ride than the 8 Series Gran Coupe, which uses coil springs. Air springs maintain proper ride height and ride more smoothly.

The S8 has a standard automatic front and rear load leveling suspension to keep ride height level with a heavy load or when towing. The S8’s height leveling suspension allows the driver to raise ride height for better off-road clearance and then lower it again for easier entering and exiting and better on-road handling. The 8 Series Gran Coupe doesn’t offer a load leveling suspension.

For a smoother ride and more stable handling, the S8’s wheelbase is 4.2 inches longer than on the 8 Series Gran Coupe (123.2 inches vs. 119 inches).

The S8 handles at .95 G’s, while the 840i Gran Coupe xDrive pulls only .92 G’s of cornering force in a Motor Trend skidpad test.

The S8 executes Motor Trend’s “Figure Eight” maneuver quicker than the 840i Gran Coupe xDrive (24.4 seconds @ .79 average G’s vs. 25.1 seconds @ .74 average G’s).

For better maneuverability, the S8’s turning circle is 1.7 feet tighter than the 840i Gran Coupe’s (38.7 feet vs. 40.4 feet). The S8’s turning circle is 2.6 feet tighter than the M850i Gran Coupe’s (38.7 feet vs. 41.3 feet).

The design of the Audi S8 amounts to more than styling. The S8 has an aerodynamic coefficient of drag of .28 Cd. That is lower than the 8 Series Gran Coupe (.3 to .32) and many sports cars. A more efficient exterior helps keep the interior quieter and helps the S8 get better fuel mileage.

The S8 uses computer-generated active noise cancellation to help remove annoying noise and vibration from the passenger compartment, especially at low frequencies. The 8 Series Gran Coupe doesn’t offer active noise cancellation.

Because it has more passenger and cargo room, the EPA rates the S8 a Large car, while the 8 Series Gran Coupe is rated a Mid-size.

The S8 has 11 cubic feet more passenger volume than the 8 Series Gran Coupe (111 vs. 100).

The S8 has 1.9 inches more front shoulder room, 1.5 inches more rear headroom, 7.7 inches more rear legroom and 3 inches more rear shoulder room than the 8 Series Gran Coupe.

For enhanced passenger comfort on long trips the S8’s available rear seats recline. The 8 Series Gran Coupe’s rear seats don’t recline.

Heated windshield washer nozzles are standard on the S8 to prevent washer fluid and nozzles from freezing and help continue to keep the windshield clear in sub-freezing temperatures. The 8 Series Gran Coupe doesn’t offer heated windshield washer nozzles.

To shield the driver and front passenger’s vision over a larger portion of the windshield and side windows, the S8 has standard extendable sun visors. The 8 Series Gran Coupe doesn’t offer extendable visors.

The S8 has standard front air conditioned seats and offers them optionally in the rear. This keeps the passengers comfortable and takes the sting out of hot seats in summer. The 8 Series Gran Coupe doesn’t offer air-conditioned seats in the rear.

The S8 has a standard center folding armrest for the rear passengers. A center armrest helps make rear passengers more comfortable and it can provide a boundary between children. The 8 Series Gran Coupe doesn’t offer a rear seat center armrest.

The S8 has standard massaging front and optional massaging rear seats. Massaging seats aren’t available in the 8 Series Gran Coupe.

The S8 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 8 Series Gran Coupe doesn’t offer a house-current electrical outlet.

The S8’s optional Park Assist Plus can parallel park or back into a parking spot by itself, starting, stopping and changing direction automatically. Remote Park Assist Plus will park and retrieve your car remotely: press a button and watch it park itself. This is ideal for tight locations. The 8 Series Gran Coupe’s automatic parking system does not offer parking by remote control.