2019 BMW 6 Series Gran Coupe vs. 2019 Audi A6

Detailed Review, Specifications & Comparison

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Safety

The 6 Series Gran Coupe has standard Active Headrests, which use a specially designed headrest to protect the driver and front passenger from whiplash. During a rear-end collision, the Active Headrests system moves the headrests forward to prevent neck and spine injuries. The A6 doesn’t offer a whiplash protection system.

The 6 Series Gran Coupe’s driver alert monitor detects an inattentive driver then sounds a warning and suggests a break. According to the NHTSA, drivers who fall asleep cause about 100,000 crashes and 1500 deaths a year. The A6 doesn’t offer a driver alert monitor.

Both the 6 Series Gran Coupe and the A6 have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee airbags, side-impact head airbags, front seatbelt pretensioners, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, post-collision automatic braking systems, daytime running lights, rearview cameras, available all wheel drive, crash mitigating brakes, night vision systems, lane departure warning systems, blind spot warning systems and around view monitors.

Warranty

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. Audi only pays for the first scheduled maintenance visit on the A6.

There are over 13 percent more BMW dealers than there are Audi dealers, which makes it easier should you ever need service under the 6 Series Gran Coupe’s warranty.

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 Audi vehicles. J.D. Power ranks BMW 11th in initial quality, above the industry average. With 18 more problems per 100 vehicles, Audi is ranked 25th, below the industry average.

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 Audi vehicles. J.D. Power ranks BMW 8th in reliability, above the industry average. With 14 more problems per 100 vehicles, Audi is ranked 13th.

Engine

The 650i Gran Coupe’s standard 4.4 turbo V8 produces 108 more horsepower (443 vs. 335) and 110 lbs.-ft. more torque (479 vs. 369) than the A6’s 3.0 turbo V6 hybrid. The M6 Gran Coupe’s standard 4.4 turbo V8 produces 217 more horsepower (552 vs. 335) and 133 lbs.-ft. more torque (502 vs. 369) than the A6’s 3.0 turbo V6 hybrid. The Alpina B6 Gran Coupe’s standard 4.4 turbo V8 produces 256 more horsepower (591 vs. 335) and 221 lbs.-ft. more torque (590 vs. 369) than the A6’s 3.0 turbo V6 hybrid. The M6 Gran Coupe Competition’s standard 4.4 turbo V8 produces 257 more horsepower (592 vs. 335) and 133 lbs.-ft. more torque (502 vs. 369) than the A6’s 3.0 turbo V6 hybrid.

As tested in Motor Trend the 650i Gran Coupe 4.4 turbo V8 is faster than the Audi A6 (automatics tested):

 

6 Series Gran Coupe

A6

Zero to 30 MPH

1.4 sec

1.8 sec

Zero to 60 MPH

4.2 sec

5 sec

Zero to 80 MPH

6.9 sec

8.1 sec

Zero to 100 MPH

10.7 sec

12.8 sec

Passing 45 to 65 MPH

2.1 sec

2.5 sec

Quarter Mile

12.7 sec

13.5 sec

Speed in 1/4 Mile

108 MPH

102.7 MPH

As tested in Motor Trend the Alpina B6 Gran Coupe 4.4 turbo V8 is faster than the A6 55 TFSI (automatics tested):

 

6 Series Gran Coupe

A6

Zero to 30 MPH

1.3 sec

1.8 sec

Zero to 60 MPH

3.3 sec

5 sec

Zero to 80 MPH

5.5 sec

8.1 sec

Zero to 100 MPH

8.4 sec

12.8 sec

Passing 45 to 65 MPH

1.6 sec

2.5 sec

Quarter Mile

11.8 sec

13.5 sec

Speed in 1/4 Mile

116.6 MPH

102.7 MPH

Fuel Economy and Range

The 6 Series Gran Coupe M6’s standard fuel tank has 1.8 gallons more fuel capacity than the A6 (21.1 vs. 19.3 gallons).

Transmission

An eight-speed automatic is standard on the BMW 6 Series Gran Coupe, for better acceleration and lower engine speed on the highway. Only a seven-speed automatic is available for the A6.

Brakes and Stopping

For better stopping power the 6 Series Gran Coupe’s brake rotors are larger than those on the A6:

 

640i/650i

M6 w/Carbon Brakes

A6

Front Rotors

13.7 inches

16.1 inches

13.3 inches

Rear Rotors

13.6 inches

15.6 inches

13 inches

The 6 Series Gran Coupe M6 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 A6 doesn’t offer ceramic brake rotors.

The 6 Series Gran Coupe stops shorter than the A6:

 

6 Series Gran Coupe

A6

 

60 to 0 MPH

102 feet

107 feet

Motor Trend

Tires and Wheels

For better traction, the M6 Gran Coupe’s tires are larger than the largest tires available on the A6 (F:265/35R20 & R:295/30R20 vs. 255/40R20).

The 6 Series Gran Coupe’s optional 275/30R20 rear tires provide better handling because they have a lower 30 series profile (height to width ratio) that provides a stiffer sidewall than the A6 Prestige’s optional 35 series tires.

Changing a flat tire near traffic can be dangerous and inconvenient. The run-flat tires available on the 6 Series Gran Coupe can be driven up to 50 miles without any air pressure, allowing you to drive to a service station for a repair. The A6 doesn’t offer run-flat tires.

Suspension and Handling

The 6 Series Gran Coupe offers an available active suspension system, which counteracts cornering forces actively, limiting body roll and improving handling and stability. Audi doesn’t offer an active suspension on the A6.

For a smoother ride and more stable handling, the 6 Series Gran Coupe’s wheelbase is 1.6 inches longer than on the A6 (116.7 inches vs. 115.1 inches).

For better handling and stability, the average track (width between the wheels) on the 6 Series Gran Coupe is 1.3 inches wider in the rear than the track on the A6.

The 6 Series Gran Coupe’s front to rear weight distribution is more even (50.1% to 49.9%) than the A6’s (55% to 45%). This gives the 6 Series Gran Coupe more stable handling and braking.

The M6 Gran Coupe handles at .97 G’s, while the A6 Prestige pulls only .93 G’s of cornering force in a Motor Trend skidpad test.

The M6 Gran Coupe executes Motor Trend’s “Figure Eight” maneuver quicker than the A6 Prestige (24.3 seconds @ .82 average G’s vs. 24.9 seconds @ .75 average G’s).

Passenger Space

The 6 Series Gran Coupe has 2.6 inches more front headroom and .8 inches more front legroom than the A6.

Ergonomics

The 6 Series Gran Coupe (except xDrive)’s optional Parking Assistant can parallel park or back into a parking spot by itself, with the driver only controlling speed with the brake pedal. The A6 doesn’t offer an automated parking system.

Model Availability

The BMW 6 Series comes in sedan and four-door hatchback bodystyles; the Audi A6 isn’t available as a four-door hatchback.

The 6 Series Gran Coupe is available in both rear-wheel drive and all-wheel drive configurations. The A6 doesn’t offer a two-wheel drive configuration.

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

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