2019 BMW 6 Series Gran Coupe vs. 2019 Mercedes S-Class

Detailed Review, Specifications & Comparison

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Safety

The 6 Series Gran Coupe 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.

When descending a steep, off-road slope, the 6 Series Gran Coupe’s standard xDrive allows you to creep down safely. The S-Class doesn’t offer xDrive.

Both the 6 Series Gran Coupe 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

The 6 Series Gran Coupe’s corrosion warranty is 7 years longer than the S-Class’ (12 vs. 5 years).

BMW pays for scheduled maintenance on the 6 Series Gran Coupe 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

J.D. Power and Associates’ 2018 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 11th in initial quality, above the industry average. With 5 more problems per 100 vehicles, Mercedes is ranked 14th.

J.D. Power and Associates’ 2018 survey of the owners of three-year-old vehicles provides the long-term dependability statistics that show that BMW vehicles are more reliable than Mercedes vehicles. J.D. Power ranks BMW 8th in reliability, above the industry average. With 20 more problems per 100 vehicles, Mercedes is ranked 15th.

From surveys of all its subscribers, Consumer Reports’ December 2018 Auto Issue reports that BMW vehicles are more reliable than Mercedes vehicles. Consumer Reports ranks BMW 9 places higher in reliability than Mercedes.

Engine

As tested in Motor Trend the 650i Gran Coupe 4.4 turbo V8 is faster than the S 560 4.7 turbo V8 (automatics tested):

 

6 Series Gran Coupe

S-Class

Zero to 60 MPH

4.2 sec

4.7 sec

Quarter Mile

12.7 sec

13.2 sec

Speed in 1/4 Mile

108 MPH

107.7 MPH

Fuel Economy and Range

On the EPA test cycle the 6 Series Gran Coupe gets better fuel mileage than the S-Class:

 

 

6 Series Gran Coupe

S-Class

 

RWD

3.0 turbo 6 cyl./8-spd. Auto

20 city/29 hwy

19 city/28 hwy

3.0 turbo V6/Auto

AWD

3.0 turbo 6 cyl./8-spd. Auto

19 city/28 hwy

18 city/28 hwy

3.0 turbo V6/Auto

Regardless of its engine, regenerative brakes improve the 6 Series Gran Coupe’s fuel efficiency by converting inertia back into energy instead of wasting it. Mercedes only offers a regenerative brake system on the S-Class Hybrid.

Transmission

The 6 Series Gran Coupe offers an available sequential manual gearbox (SMG). With no clutch pedal to worry about and a fully automatic mode, an SMG is much more efficient than a conventional automatic but just as easy to drive. The S-Class doesn’t offer an SMG.

Brakes and Stopping

The 6 Series Gran Coupe stops much shorter than the S-Class:

 

6 Series Gran Coupe

S-Class

 

70 to 0 MPH

162 feet

190 feet

Car and Driver

60 to 0 MPH

102 feet

119 feet

Motor Trend

Tires and Wheels

For better traction, the M6 Gran Coupe’s tires are larger than the largest tires available on the S-Class (F:265/35R20 & R:295/30R20 vs. F:255/40R20 & R:285/35R20).

The 640i Gran Coupe’s standard tires provide better handling because they have a lower 45 series profile (height to width ratio) that provides a stiffer sidewall than the S-Class’ standard 50 series tires. The 6 Series Gran Coupe’s optional 245/35R20 front and 275/30R20 rear tires have a lower 35 series front and 30 series rear profile than the S 63’s 40 series front and 35 series rear tires.

Suspension and Handling

The M6 Gran Coupe handles at .97 G’s, while the S 560 pulls only .83 G’s of cornering force in a Motor Trend skidpad test.

The M6 Gran Coupe executes Motor Trend’s “Figure Eight” maneuver 2.2 seconds quicker than the S 560 (24.3 seconds @ .82 average G’s vs. 26.5 seconds @ .7 average G’s).

Chassis

The BMW 6 Series Gran Coupe may be more efficient, handle and accelerate better because it weighs about 250 to 400 pounds less than the Mercedes S-Class.

The 6 Series Gran Coupe is 9.7 inches shorter than the S-Class, making the 6 Series Gran Coupe easier to handle, maneuver and park in tight spaces.

As tested by Car and Driver while at idle, the interior of the 640i Gran Coupe is quieter than the S 560 (36 vs. 40 dB).

Passenger Space

The 6 Series Gran Coupe has .9 inches more front headroom, .7 inches more front legroom and 1.2 inches more rear legroom than the S-Class.

Cargo Capacity

The 6 Series Gran Coupe’s standard rear seats fold to accommodate long and bulky cargo. The S-Class doesn’t offer folding rear seats.

Ergonomics

In poor weather, headlights can lose their effectiveness as grime builds up on their lenses. This can reduce visibility without the driver realizing. The 6 Series Gran Coupe has standard headlight washers to keep headlight output high. The S-Class doesn’t offer headlight washers.

Economic Advantages

Insurance will cost less for the 6 Series Gran Coupe owner. The Complete Car Cost Guide estimates that insurance for the 6 Series Gran Coupe will cost $715 less than the S-Class over a five-year period.

The 6 Series Gran Coupe will cost the buyer less in the long run because of its superior resale value. The IntelliChoice estimates that the 6 Series Gran Coupe will retain 36.57% to 37.86% of its original price after five years, while the S-Class only retains 32.06% to 35.71%.

IntelliChoice estimates that five-year ownership costs (depreciation, financing, insurance, fuel, fees, repairs and maintenance) for the BMW 6 Series Gran Coupe will be $14979 to $46379 less than for the Mercedes S-Class.

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

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