2019 Audi A6 vs. 2019 Cadillac CT6

Detailed Review, Specifications & Comparison

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Safety

For enhanced safety, the front and rear seat shoulder belts of the Audi A6 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 Cadillac CT6 doesn’t offer pretensioners for the rear seat belts.

Both the A6 and CT6 have child safety locks to prevent children from opening the rear doors. The A6 has power child safety locks, allowing the driver to activate and deactivate them from the driver's seat and to know when they're engaged. The CT6’s child locks have to be individually engaged at each rear door with a manual switch. The driver can’t know the status of the locks without opening the doors and checking them.

The A6 has a standard Secondary Collision Brake Assist, which automatically applies the brakes in the event of a crash to help prevent secondary collisions and prevent further injuries. The CT6 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.

To provide maximum traction and stability on all roads, All-Wheel Drive is standard on the A6. But it costs extra on the CT6.

Both the A6 and the CT6 have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee airbags, side-impact head airbags, height adjustable front shoulder belts, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, daytime running lights, rearview cameras, available night vision systems, lane departure warning systems, blind spot warning systems, around view monitors and rear cross-path warning.

Warranty

The A6’s corrosion warranty is 6 years longer than the CT6’s (12 vs. 6 years).

Reliability

J.D. Power and Associates’ 2018 survey of the owners of three-year-old vehicles provides the long-term dependability statistics that show that Audi vehicles are more reliable than Cadillac vehicles. J.D. Power ranks Audi 13th in reliability, above the industry average. With 45 more problems per 100 vehicles, Cadillac is ranked 27th.

From surveys of all its subscribers, Consumer Reports’ December 2018 Auto Issue reports that Audi vehicles are more reliable than Cadillac vehicles. Consumer Reports ranks Audi 21 places higher in reliability than Cadillac.

Engine

The A6’s 3.0 turbo V6 hybrid produces 70 more horsepower (335 vs. 265) and 74 lbs.-ft. more torque (369 vs. 295) than the CT6’s standard 2.0 turbo 4 cyl. The A6’s 3.0 turbo V6 hybrid produces 84 lbs.-ft. more torque (369 vs. 285) than the CT6’s optional 3.6 DOHC V6.

As tested in Motor Trend the Audi A6 is faster than the Cadillac CT6 turbo 4 cyl.:

 

A6

CT6

Zero to 60 MPH

5 sec

6.4 sec

Zero to 80 MPH

8.1 sec

10.8 sec

Passing 45 to 65 MPH

2.5 sec

3.6 sec

Quarter Mile

13.5 sec

14.7 sec

Speed in 1/4 Mile

102.7 MPH

92.8 MPH

Fuel Economy and Range

On the EPA test cycle the A6 gets better fuel mileage than the CT6 V6 AWD (22 city/29 hwy vs. 18 city/27 hwy).

Regenerative brakes improve the A6’s fuel efficiency by converting inertia back into energy instead of wasting it. The CT6 doesn’t offer a regenerative braking system.

To lower fuel costs and make buying fuel easier, the Audi A6 uses regular unleaded gasoline (premium recommended for maximum performance). The CT6 with the 3.0 turbo V6 engine requires premium, which can cost 20 to 55 cents more per gallon.

Environmental Friendliness

In its Green Vehicle Guide, the U.S. Environmental Protection Agency (EPA) rates the Audi A6 higher (5 out of 10) than the Cadillac CT6 (3 to 5). This means the A6 produces up to 16.5 pounds less smog-producing pollutants than the CT6 every 15,000 miles.

Transmission

The A6 offers a standard 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 CT6 doesn’t offer an SMG or a conventional manual transmission.

Brakes and Stopping

For better stopping power the A6’s standard brake rotors are larger than those on the CT6:

 

A6

CT6

Front Rotors

13.3 inches

12.6 inches

Rear Rotors

13 inches

12.4 inches

The A6 stops much shorter than the CT6:

 

A6

CT6

 

60 to 0 MPH

107 feet

117 feet

Motor Trend

Tires and Wheels

For better traction, the A6 has larger standard tires than the CT6 (245/45R19 vs. 235/50R18). The A6’s optional tires are larger than the largest tires available on the CT6 (255/40R20 vs. 245/45R19).

The A6’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 CT6’s standard 50 series tires. The A6 Prestige’s optional tires have a lower 35 series profile than the CT6’s optional 40 series tires.

For better ride, handling and brake cooling the A6 has standard 19-inch wheels. Smaller 18-inch wheels are standard on the CT6. The A6 Prestige’s optional 21-inch wheels are larger than the 20-inch wheels optional on the CT6.

Suspension and Handling

The A6 Prestige handles at .93 G’s, while the CT6 pulls only .82 G’s of cornering force in a Motor Trend skidpad test.

The A6 Prestige executes Motor Trend’s “Figure Eight” maneuver 1.8 seconds quicker than the CT6 (24.9 seconds @ .75 average G’s vs. 26.7 seconds @ .66 average G’s).

For better maneuverability, the A6’s turning circle is 3.6 feet tighter than the CT6’s (36.4 feet vs. 40 feet).

Chassis

The A6 is 11.4 inches shorter than the CT6, making the A6 easier to handle, maneuver and park in tight spaces.

Passenger Space

The A6 has .1 inches more rear headroom and .3 inches more rear shoulder room than the CT6.

Cargo Capacity

The A6’s standard rear seats fold to accommodate long and bulky cargo. The CT6 doesn’t offer folding rear seats, only a ski pass-through.

A standard locking glovebox (which can’t be accessed with the valet key) keeps your small valuables safer in the A6. The CT6 doesn’t offer locking storage for small valuables.

Towing

The A6’s standard towing capacity is much higher than the CT6’s (3500 vs. 1000 pounds).

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 A6 Premium Plus/Prestige has standard headlight washers to keep headlight output high. The CT6 doesn’t offer headlight washers.

The CT6 Premium Luxury/Platinum/Sport’s cornering lamps activate a lamp on the front corner when the turn signal is activated. The A6’s optional adaptive cornering lights turn the actual headlight unit up to several degrees, depending on steering wheel angle and vehicle speed. This lights a significant distance into corners at any speed.

Recommendations

The Audi A6/S6 outsold the Cadillac CT6 by 6% during the 2018 model year.

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

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