SONS Automotive Group Compares 2018 Cadillac CT6 VS 2018 Audi A6 Near Norcross, GA

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2018 Cadillac CT6

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2018 Cadillac CT6

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2018 Audi A6

Safety Comparison

In the past twenty years hundreds of infants and young children have died after being left in vehicles, usually by accident. When turning the vehicle off, drivers of the CT6 are reminded to check the back seat if they opened the rear door before starting out. The A6 doesn’t offer a back seat reminder.

Over 200 people are killed each year when backed over by motor vehicles. The CT6 (except Base/Luxury) offers optional Reverse Automatic Braking which use rear sensors to monitor and automatically apply the brakes to prevent a rear collision. The A6 doesn’t offer backup collision prevention brakes.

To help make backing safer, the CT6’s 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 A6 doesn’t offer a cross-path warning system.

The CT6 has standard OnStar®, which uses a global positioning satellite (GPS) receiver and a cellular system to get turn-by-turn driving directions, remotely unlock your doors if you lock your keys in, help track down your vehicle if it’s stolen or send emergency personnel to the scene if any airbags deploy. The A6 doesn’t offer a GPS response system, only a navigation computer with no live response for emergencies, so if you’re involved in an accident and you’re incapacitated help may not come as quickly.

Both the CT6 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, height adjustable front shoulder belts, plastic fuel tanks, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, daytime running lights, rearview cameras, available crash mitigating brakes, night vision systems, lane departure warning systems, blind spot warning systems and around view monitors.

Warranty Comparison

Cadillac’s powertrain warranty covers the CT6 2 years and 20,000 miles longer than Audi covers the A6. Any repair needed on the engine, transmission, axles, joints or driveshafts is fully covered for 6 years or 70,000 miles. Coverage on the A6 ends after only 4 years or 50,000 miles.

Cadillac pays for scheduled maintenance on the CT6 for 3 years and 36,000 miles. Cadillac 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 3 times as many Cadillac dealers as there are Audi dealers, which makes it much easier should you ever need service under the CT6’s warranty.

Reliability Comparison

J.D. Power and Associates’ 2017 Initial Quality Study of new car owners surveyed provide the statistics that show that Cadillac vehicles are better in initial quality than Audi vehicles. J.D. Power ranks Cadillac 20th in initial quality. With 10 more problems per 100 vehicles, Audi is ranked 26th.

Engine Comparison

The CT6 has more powerful engines than the A6:




CT6 2.0 turbo 4 cyl.

265 HP

295 lbs.-ft.

CT6 3.6 DOHC V6

335 HP

285 lbs.-ft.

CT6 3.0 turbo V6

404 HP

400 lbs.-ft.

A6 2.0T 2.0 turbo 4 cyl.

252 HP

273 lbs.-ft.

A6 3.0T 3.0 supercharged V6

340 HP

325 lbs.-ft.

As tested in Car and Driver the Cadillac CT6 twin turbo V6 is faster than the A6 3.0T 3.0 supercharged V6:




Zero to 30 MPH

1.7 sec

1.9 sec

Zero to 60 MPH

5 sec

5.4 sec

Zero to 80 MPH

7.9 sec

8.8 sec

Zero to 100 MPH

12.2 sec

13.4 sec

Passing 50 to 70 MPH

3.5 sec

3.6 sec

Quarter Mile

13.5 sec

13.9 sec

Speed in 1/4 Mile

105 MPH

102 MPH

Fuel Economy and Range Comparison

An engine control system that can shut down half of the engine’s cylinders helps improve the CT6 V6’s fuel efficiency. The A6 doesn’t offer a system that can shut down part of the engine.

The CT6 has a standard cap-less fueling system. The fuel filler is automatically opened when the fuel nozzle is inserted and automatically closed when it’s removed. This eliminates the need to unscrew and replace the cap and it reduces fuel evaporation, which causes pollution. The A6 doesn’t offer a cap-less fueling system.

Brakes and Stopping Comparison

The CT6’s standard front and rear disc brakes are vented to help dissipate heat for shorter stops with less fading. The rear discs standard on the A6 2.0T are solid, not vented.

The CT6 stops much shorter than the A6:





70 to 0 MPH

152 feet

171 feet

Car and Driver

60 to 0 MPH

106 feet

117 feet

Motor Trend

Suspension and Handling Comparison

The CT6 offers an optional driver-adjustable suspension system. It allows the driver to choose between an extra-supple ride, reducing fatigue on long trips, or a sport setting, which allows maximum control for tricky roads. The A6’s suspension doesn’t offer adjustable shock absorbers.

For a smoother ride and more stable handling, the CT6’s wheelbase is 7.8 inches longer than on the A6 (122.4 inches vs. 114.6 inches).

The CT6 AWD handles at .88 G’s, while the A6 2.0T Premium Quattro pulls only .84 G’s of cornering force in a Motor Trend skidpad test.

The CT6 AWD executes Motor Trend’s “Figure Eight” maneuver 1.4 seconds quicker than the A6 2.0T Premium Quattro (25.4 seconds @ .75 average G’s vs. 26.8 seconds @ .66 average G’s).

Chassis Comparison

The front grille of the CT6 uses electronically controlled shutters to close off airflow and reduce drag when less engine cooling is needed. This helps improve highway fuel economy. The A6 doesn’t offer active grille shutters.

The CT6 offers available computer-generated active noise cancellation to help remove annoying noise and vibration from the passenger compartment, especially at low frequencies. The A6 doesn’t offer active noise cancellation.

As tested by Car and Driver, the interior of the CT6 is quieter than the A6 3.0T Premium Plus Quattro:





72 dB

77 dB

70 MPH Cruising

66 dB

68 dB

Passenger Space Comparison

Because it has more passenger and cargo room, the CT6 is rated a Large car by the EPA, while the A6 is rated a Mid-size.

The CT6 has 24 cubic feet more passenger volume than the A6 (121.2 vs. 97.2).

The CT6 has 2.9 inches more front headroom, 1.1 inches more front legroom, .7 inches more front shoulder room, .2 inches more rear headroom and 3 inches more rear legroom than the A6.

For enhanced passenger comfort on long trips the CT6’s available rear seats recline. The A6’s rear seats don’t recline.

Cargo Capacity Comparison

The CT6 has a much larger trunk than the A6 (15.3 vs. 14.1 cubic feet).

Ergonomics Comparison

The CT6 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 A6 doesn’t offer a remote starting system.

The CT6’s instruments include an oil pressure gauge and a temperature gauge – which could save your engine! Often ‘idiot lights’ don’t warn you until damage has been done. The A6 does not have an oil pressure gauge.

On a hot day the CT6’s driver can lower all the windows from a distance using the keyless remote. The driver of the A6 can’t use the remote to operate the windows.

To shield the driver and front passenger’s vision over a larger portion of the windshield and side windows, the CT6 has standard extendable sun visors. The A6 doesn’t offer extendable visors.

When the CT6 is put in reverse, both rearview mirrors tilt from their original position. This gives the driver a better view of the curb during parallel parking maneuvers. Shifting out of reverse puts the mirrors into their original positions. The A6’s mirrors don’t automatically adjust for backing.

Optional air conditioned front and rear seats keep the CT6’s passengers comfortable and take the sting out of hot leather in Summer. The A6 doesn’t offer air-conditioned seats in the rear.

The CT6 Luxury/Premium/Platinum has a 115-volt a/c outlet, allowing you to recharge a laptop or run small household appliances without special adapters that can break or get misplaced. The A6 doesn’t offer a house-current electrical outlet.

The CT6 Luxury/Premium/Platinum’s Automatic Park Assist 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.

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