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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 M8 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 M8 doesn’t offer a whiplash protection system.
Both the AMG S-Class Coupe and the M8 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, all wheel drive, 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 3 more horsepower (603 vs. 600) and 111 lbs.-ft. more torque (664 vs. 553) than the M8’s standard 4.4 turbo V8. The AMG S-Class Coupe’s 4.0 turbo V8 produces 111 lbs.-ft. more torque (664 vs. 553) than the M8 Competition’s standard 4.4 turbo V8.
On the EPA test cycle the AMG S 63 Coupe gets better fuel mileage than the M8 (17 city/27 hwy vs. 15 city/21 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 M8 doesn’t offer a system that can shut down part of the engine.
The AMG S-Class Coupe has a gallon more fuel capacity than the M8 (21.1 vs. 20.1 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 M8.
For better stopping power the AMG S-Class Coupe’s optional front brake rotors are larger than those optional on the M8:
The front and rear suspension of the AMG S-Class Coupe uses air springs for a smoother, controlled ride than the M8, 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 M8 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 M8 doesn’t offer drift compensation steering.
For a smoother ride and more stable handling, the AMG S-Class Coupe’s wheelbase is 4.6 inches longer than on the M8 (115.9 inches vs. 111.3 inches).
For better maneuverability, the AMG S-Class Coupe’s turning circle is .9 feet tighter than the M8’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 M8 Coupe is rated a Subcompact.
The AMG S-Class Coupe has 9.6 cubic feet more passenger volume than the M8 (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 M8 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.
Unlike the driver-only memory system in the M8, the AMG S-Class Coupe has standard driver and passenger memory, so that when drivers switch, the memory setting adjusts the driver’s seat, steering wheel position and outside mirror angle and the front passenger seat also adjusts to the new passenger’s preset preferences.
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 M8 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 M8 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 M8 doesn’t offer a rear sunshade.
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 M8.
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 M8 doesn’t offer a house-current electrical outlet.
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