Son's Automotive Group Compares 2018 BMW 7 SERIES VS 2018 Mercedes S-Class Near Norcross, GA

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2018 Mercedes S-Class

Safety Comparison

The 7 Series has standard Post-Crash Braking, which automatically apply the brakes in the event of a crash to help prevent secondary collisions and prevent further injuries. The S-Class 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.

Over 200 people are killed each year when backed over by motor vehicles. The 7 Series offers an optional backup collision prevention system which use rear sensors to monitor and automatically apply the brakes to prevent a rear collision. The S-Class doesn’t offer backup collision prevention brakes.

When descending a steep, off-road slope, the 7 Series xDrive’s standard Hill Descent Control allows you to creep down safely. The S-Class doesn’t offer Hill Descent Control.

To help make backing safer, the 7 Series’ 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 S-Class doesn’t offer a cross-path warning system.

Both the 7 Series and the S-Class have standard driver and passenger frontal airbags, front side-impact airbags, driver knee airbags, side-impact head airbags, front seatbelt pretensioners, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, daytime running lights, rearview cameras, driver alert monitors, available all wheel drive, crash mitigating brakes, night vision systems, lane departure warning systems, blind spot warning systems and around view monitors.

Warranty Comparison

The 7 Series’ corrosion warranty is 7 years longer than the S-Class’ (12 vs. 5 years).

BMW pays for scheduled maintenance on the 7 Series for 3 years and 36,000 miles. BMW will pay for oil changes, lubrication and any other required maintenance. Mercedes doesn’t pay scheduled maintenance for the S-Class.

Reliability Comparison

J.D. Power and Associates’ 2017 Initial Quality Study of new car owners surveyed provide the statistics that show that BMW vehicles are better in initial quality than Mercedes vehicles. J.D. Power ranks BMW 6th in initial quality, above the industry average. With 14 more problems per 100 vehicles, Mercedes is ranked 17th, below the industry average.

From surveys of all its subscribers, Consumer Reports’ April 2017 Auto Issue reports that BMW vehicles are more reliable than Mercedes vehicles. Consumer Reports ranks BMW 9 places higher in reliability than Mercedes.

Engine Comparison

As tested in Car and Driver the 750i is faster than the S 560:


7 Series


Zero to 30 MPH

1.9 sec

2 sec

Zero to 60 MPH

4.4 sec

4.9 sec

Zero to 80 MPH

6.7 sec

7.7 sec

Zero to 100 MPH

10.1 sec

11.5 sec

Passing 30 to 50 MPH

2.7 sec

2.9 sec

Quarter Mile

12.8 sec

13.4 sec

Speed in 1/4 Mile

112 MPH

108 MPH

Top Speed

155 MPH

132 MPH

Fuel Economy and Range Comparison

On the EPA test cycle the 740e running on electricity gets better fuel mileage than the S 550e running on electricity (62 city/68 hwy vs. 54 city/63 hwy MPGe).

On the EPA test cycle the 7 Series gets better fuel mileage than the S-Class:



7 Series





21 city/29 hwy

19 city/28 hwy




20 city/29 hwy

18 city/28 hwy


Regardless of its engine, regenerative brakes improve the 7 Series’ fuel efficiency by converting inertia back into energy instead of wasting it. Mercedes only offers a regenerative brake system on the S-Class Hybrid.

Brakes and Stopping Comparison

The 7 Series stops much shorter than the S-Class:


7 Series



70 to 0 MPH

151 feet

190 feet

Car and Driver

60 to 0 MPH

113 feet

119 feet

Motor Trend

Tires and Wheels Comparison

The Alpina B7’s optional 255/35R21 front and 295/30R21 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 S 63’s 40 series front and 35 series rear tires.

For better ride, handling and brake cooling the Alpina B7 offers optional 21-inch wheels. The S-Class’ largest wheels are only 20-inches.

Suspension and Handling Comparison

The 7 Series 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 S-Class doesn’t offer an active sway bar system.

The Alpina B7 handles at .97 G’s, while the S 550e pulls only .81 G’s of cornering force in a Car and Driver skidpad test.

The 750i xDrive executes Motor Trend’s “Figure Eight” maneuver 1.1 seconds quicker than the S 560 (25.4 seconds @ .75 average G’s vs. 26.5 seconds @ .7 average G’s).

Chassis Comparison

The BMW 7 Series may be more efficient, handle and accelerate better because it weighs up to about 450 pounds less than the Mercedes S-Class.

The 7 Series is 8.1 inches shorter than the Maybach S-Class, making the 7 Series easier to handle, maneuver and park in tight spaces.

The design of the BMW 7 Series amounts to more than styling. The 7 Series has an aerodynamic coefficient of drag of .27 Cd. That is lower than the S-Class (.27 to .28) and many sports cars. A more efficient exterior helps keep the interior quieter and helps the 7 Series get better fuel mileage.

The front grille of the 7 Series uses electronically controlled shutters to close off airflow and reduce drag when less engine cooling is needed. This helps improve highway fuel economy. The S-Class doesn’t offer active grille shutters.

As tested by Car and Driver, the interior of the 750i xDrive is quieter than the S 560:


7 Series


At idle

38 dB

40 dB


72 dB

75 dB

Passenger Space Comparison

The 7 Series has 1 inch more rear headroom and 4.4 inches more rear legroom than the Maybach S-Class.

Cargo Capacity Comparison

The 7 Series has a much larger trunk than the Maybach S-Class (14 vs. 12.3 cubic feet).

Economic Advantages Comparison

Insurance will cost less for the 7 Series owner. The Complete Car Cost Guide estimates that insurance for the 7 Series will cost $1155 less than the S-Class over a five-year period.

The 7 Series will cost the buyer less in the long run because of its superior resale value. The IntelliChoice estimates that the 7 Series will retain 34.03% to 36.68% of its original price after five years, while the S-Class only retains 30.95% to 33.39%.

According to The Car Book by Jack Gillis, the 7 Series is less expensive to operate than the S-Class because it costs $432 less to do the manufacturer’s suggested maintenance for 50,000 miles. Typical repairs cost much less on the 7 Series than the S-Class, including $221 less for a water pump, $732 less for an alternator, $152 less for front brake pads, $95 less for a starter and $323 less for a power steering pump.

IntelliChoice estimates that five-year ownership costs (depreciation, financing, insurance, fuel, fees, repairs and maintenance) for the BMW 7 Series will be $21519 to $42996 less than for the Mercedes S-Class.

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