2019 Mercedes CLS vs. 2019 BMW 6 Series Gran Coupe

Detailed Review, Specifications & Comparison

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To help make backing safer, the CLS’ 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 6 Series Gran Coupe doesn’t offer a cross-path warning system.

Both the CLS and the 6 Series Gran Coupe have standard driver and passenger frontal airbags, front side-impact airbags, driver knee airbags, side-impact head airbags, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, daytime running lights, rearview cameras, driver alert monitors, available all wheel drive, lane departure warning systems and around view monitors.


There are over 10 percent more Mercedes dealers than there are BMW dealers, which makes it easier should you ever need service under the CLS’ warranty.


As tested in Car and Driver the CLS 450 is faster than the 640i Gran Coupe (automatics tested):



6 Series

Zero to 60 MPH

4.7 sec

5.6 sec

Zero to 100 MPH

11.5 sec

15.1 sec

5 to 60 MPH Rolling Start

5.6 sec

6.4 sec

Quarter Mile

13.2 sec

14.3 sec

Speed in 1/4 Mile

107 MPH

97 MPH

Fuel Economy and Range

On the EPA test cycle the CLS gets better fuel mileage than the 6 Series Gran Coupe:




6 Series





15 city/22 hwy




24 city/31 hwy

20 city/29 hwy





18 city/26 hwy





14 city/20 hwy




23 city/30 hwy

19 city/28 hwy



AMG 53/Auto

21 city/27 hwy

17 city/25 hwy


The CLS has 2.6 gallons more fuel capacity than the 6 Series Gran Coupe’s standard fuel tank (21.1 vs. 18.5 gallons), for longer range between fill-ups.


A nine-speed automatic is available on the Mercedes CLS, for better acceleration and lower engine speed on the highway. Only an eight-speed automatic is available for the 6 Series Gran Coupe.

Brakes and Stopping

For better stopping power the CLS’ standard brake rotors are larger than those on the 6 Series Gran Coupe:



6 Series

Front Rotors

14.2 inches

13.7 inches

Rear Rotors

14.2 inches

13.6 inches

The CLS stops shorter than the 6 Series Gran Coupe:



6 Series


70 to 0 MPH

167 feet

170 feet

Car and Driver

Tires and Wheels

For better traction and acceleration, the CLS has larger rear tires than the 6 Series Gran Coupe (275/35R19 vs. 245/45R18).

The CLS’ 245/40R19 front and 275/35R19 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 640i Gran Coupe’s standard 45 series tires.

For better ride, handling and brake cooling the CLS 450 has standard 19-inch wheels. Smaller 18-inch wheels are standard on the 640i Gran Coupe.

Changing a flat tire near traffic can be dangerous and inconvenient. The run-flat tires standard on the CLS can be driven up to 50 miles without any air pressure, allowing you to drive to a service station for a repair. Run-flat tires aren’t available on some tire packages on the 6 Series Gran Coupe.

Suspension and Handling

The CLS’ 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 6 Series Gran Coupe doesn’t offer drift compensation steering.

The CLS 450 4MATIC handles at .93 G’s, while the 640i Gran Coupe pulls only .89 G’s of cornering force in a Car and Driver skidpad test.

For better maneuverability, the CLS’ turning circle is .1 feet tighter than the 6 Series Gran Coupe’s (39.1 feet vs. 39.2 feet). The CLS’ turning circle is 1.9 feet tighter than the M6 Gran Coupe’s (39.1 feet vs. 41 feet).


The design of the Mercedes CLS amounts to more than styling. The CLS has an aerodynamic coefficient of drag of .27 Cd. That is lower than the 6 Series Gran Coupe (.29 to .33) and many sports cars. A more efficient exterior helps keep the interior quieter and helps the CLS get better fuel mileage.

Passenger Space

The CLS has 1.1 inches more front shoulder room and 1.9 inches more rear shoulder room than the 6 Series Gran Coupe.

Cargo Capacity

To make loading and unloading groceries and cargo easier when your hands are full, the CLS’ power trunk can be opened or closed just by kicking your foot under the back bumper, leaving your hands completely free. The 6 Series Gran Coupe doesn’t offer a power or hands-free opening trunk.

Servicing Ease

J.D. Power and Associates surveys of service recipients show that Mercedes service is better than BMW. J.D. Power ranks Mercedes 6th in service department satisfaction (above the industry average). With a 11% lower rating, BMW is ranked 8th.


The CLS has a standard remote vehicle starting system, so the vehicle can be started from inside the driver's house. This allows the driver to comfortably warm up the engine before going out to the vehicle. The climate system will also automatically heat or cool the interior. The 6 Series Gran Coupe doesn’t offer a remote starting system.

The CLS 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 6 Series Gran Coupe doesn’t offer a house-current electrical outlet.

Economic Advantages

The CLS will cost the buyer less in the long run because of its superior resale value. The IntelliChoice estimates that the CLS will retain 38.73% to 45.11% of its original price after five years, while the 6 Series Gran Coupe only retains 36.57% to 37.86%.

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

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