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For enhanced safety, the front and rear seat shoulder belts of the Mercedes AMG S-Class Coupe 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 doesn’t offer pretensioners for the rear seat belts.
The AMG S-Class Coupe has standard NECK-PRO Front Head Restraints, which use a specially designed headrest to protect the driver and front passenger from whiplash. During a rear-end collision, the NECK-PRO Front Head Restraints system moves the headrests forward to prevent neck and spine injuries. The 8 Series doesn’t offer a whiplash protection system.
To provide maximum traction and stability on all roads, All-Wheel Drive is standard on the AMG S-Class Coupe. But it costs extra on the 8 Series.
Both the AMG S-Class Coupe and the 8 Series 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, daytime running lights, rearview cameras, driver alert monitors and available night vision systems.
There are over 10 percent more Mercedes dealers than there are BMW dealers, which makes it easier should you ever need service under the AMG S-Class Coupe’s warranty.
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 BMW vehicles. J.D. Power ranks Mercedes 12th in initial quality. With 8 more problems per 100 vehicles, BMW is ranked 20th.
The AMG S-Class Coupe’s 4.0 turbo V8 produces 268 more horsepower (603 vs. 335) and 296 lbs.-ft. more torque (664 vs. 368) than the 840i’s standard 3.0 turbo 6-cylinder. The AMG S-Class Coupe’s 4.0 turbo V8 produces 80 more horsepower (603 vs. 523) and 111 lbs.-ft. more torque (664 vs. 553) than the M850i’s standard 4.4 turbo V8.
On the EPA test cycle the AMG S 63 4MATIC Coupe gets better fuel mileage than the M850i Coupe (17 city/27 hwy vs. 18 city/25 hwy).
An engine control system that can shut down some of the engine’s cylinders helps improve the AMG S-Class Coupe’s fuel efficiency. The 8 Series doesn’t offer a system that can shut down part of the engine.
The AMG S-Class Coupe has 3.1 gallons more fuel capacity than the 8 Series (21.1 vs. 18 gallons), for longer range between fill-ups.
A nine-speed automatic is standard on the Mercedes AMG S-Class Coupe, for better acceleration and lower engine speed on the highway. Only an eight-speed automatic is available for the 8 Series.
For better stopping power the AMG S-Class Coupe’s optional front brake rotors are larger than those on the 8 Series:
The AMG S-Class 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 8 Series doesn’t offer ceramic brake rotors.
The AMG S-Class Coupe stops shorter than the 8 Series:
60 to 0 MPH
For better traction, the AMG S-Class Coupe has larger tires than the 8 Series (F:255/40R20 & R:285/35R20 vs. F:245/35R20 & R:275/30R20).
The AMG S-Class Coupe’s 255/40R20 front and 285/35R20 rear tires provide better handling because they have a lower 40 series front and 35 series rear profile (height to width ratio) that provides a stiffer sidewall than the 8 Series’ standard 45 series front and 40 series rear tires.
For better ride, handling and brake cooling the AMG S-Class Coupe has standard 20-inch wheels. Smaller 18-inch wheels are standard on the 8 Series.
The front and rear suspension of the AMG S-Class Coupe uses air springs for a smoother, controlled ride than the 8 Series, which uses coil springs. Air springs maintain proper ride height and ride more smoothly.
The AMG S-Class Coupe has a standard automatic front and rear load leveling suspension to keep ride height level with a heavy load or when towing. The AMG S-Class Coupe’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 doesn’t offer a load leveling suspension.
The AMG S-Class Coupe’s drift compensation steering can automatically compensate for road conditions which would cause the vehicle to drift from side to side, helping the driver to keep the vehicle straight more easily. The 8 Series doesn’t offer drift compensation steering.
For a smoother ride and more stable handling, the AMG S-Class Coupe’s wheelbase is 4.8 inches longer than on the 8 Series (115.9 inches vs. 111.1 inches).
For better maneuverability, the AMG S-Class Coupe’s turning circle is .1 feet tighter than the 8 Series’ (38.1 feet vs. 38.2 feet). The AMG S-Class Coupe’s turning circle is .9 feet tighter than the 8 Series xDrive’s (38.1 feet vs. 39 feet).
Because it has more passenger and cargo room, the EPA rates the AMG S-Class Coupe a Compact car, while the 8 Series Coupe is rated a Subcompact.
The AMG S-Class Coupe has 9.6 cubic feet more passenger volume than the 8 Series (90.6 vs. 81).
The AMG S-Class Coupe has 1.1 inches more front headroom, 3.1 inches more rear headroom, 3.9 inches more rear legroom and 4.5 inches more rear shoulder room than the 8 Series Coupe.
J.D. Power and Associates surveys of service recipients show that Mercedes service is better than BMW. J.D. Power ranks Mercedes fifth in service department satisfaction. With a 23% lower rating, BMW is ranked 11th.
Heated windshield washer fluid is standard on the AMG S-Class Coupe to defrost the washer nozzles and quickly clear ice and frost from the windshield without scraping. The 8 Series doesn’t offer heated windshield washer fluid.
To shield the driver and front passenger’s vision over a larger portion of the windshield and side windows, the AMG S-Class Coupe has standard extendable sun visors. The 8 Series doesn’t offer extendable visors.
A power rear sunshade is standard in the AMG S-Class Coupe to help block heat and glare for the rear passengers. The 8 Series doesn’t offer a rear sunshade.
Both the AMG S-Class Coupe and the 8 Series have standard heated front seats. The AMG S-Class Coupe also offers optional heated rear seats to keep those passengers extremely comfortable in the winter. Heated rear seats aren’t available in the 8 Series.
The AMG S-Class Coupe has a standard center folding armrest for the rear passengers. A center armrest helps make rear passengers more comfortable. The 8 Series doesn’t offer a rear seat center armrest.
The AMG S-Class Coupe has standard massaging front seats in order to maximize comfort and eliminate fatigue on long trips. Massaging seats aren’t available in the 8 Series.
The AMG S-Class Coupe has a 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 doesn’t offer a house-current electrical outlet.
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