Certified Benz & Beemer Compares 2015 BMW 6 SERIES VS 2015 Cadillac ATS Near Phoenix, AZ

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2015 Cadillac ATS

Safety Comparison

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

A passive infrared night vision system optional on the 6 Series helps the driver to more easily detect people, animals or other objects in front of the vehicle at night. Using an infrared camera to detect heat, the system then displays the image on a monitor in the dashboard. The ATS Coupe doesn’t offer a night vision system.

The 6 Series offers an optional Side and Top View Cameras to allow the driver to see objects all around the vehicle on a screen. The ATS Coupe only offers a rear monitor and front and rear parking sensors that beep or flash a light. That doesn’t help with obstacles to the sides.

Both the 6 Series and the ATS Coupe have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee airbags, side-impact head airbags, front seatbelt pretensioners, plastic fuel tanks, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding and available all wheel drive.

Warranty Comparison

The 6 Series’ corrosion warranty is 6 years longer than the ATS Coupe’s (12 vs. 6 years).

Reliability Comparison

J.D. Power and Associates rated the 6 Series third among midsize premium sporty cars in their 2013 Initial Quality Study. The ATS Coupe isn’t in the top three in its category.

J.D. Power and Associates’ 2014 Initial Quality Study of new car owners surveyed provide the statistics that show that BMW vehicles are better in initial quality than Cadillac vehicles. J.D. Power ranks BMW 8th in initial quality, above the industry average. With 7 more problems per 100 vehicles, Cadillac is ranked 13th.

Engine Comparison

The 6 Series has more powerful engines than the ATS Coupe:



640i 3.0 turbo 6 cyl.

315 HP

330 lbs.-ft.

650i 4.4 turbo V8

445 HP

480 lbs.-ft.

M6 4.4 turbo V8

560 HP

502 lbs.-ft.

M6 Competition Package 4.4 turbo V8

575 HP

500 lbs.-ft.

ATS Coupe 2.0 turbo 4 cyl.

272 HP

295 lbs.-ft.

ATS Coupe 3.6 DOHC V6

321 HP

275 lbs.-ft.

Fuel Economy and Range Comparison

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

6 Series

ATS Coupe


Turbo 4 cyl./Auto


21 city/30 hwy

Turbo 6 cyl./Auto

21 city/32 hwy

18 city/28 hwy



Turbo 4 cyl./Auto


20 city/28 hwy

Turbo 6 cyl./Auto

20 city/29 hwy

18 city/26 hwy


Regenerative brakes improve the 6 Series’ fuel efficiency by converting inertia back into energy instead of wasting it. The ATS Coupe doesn’t offer a regenerative braking system.

In heavy traffic or at stoplights the 6 Series’ engine automatically turns off when the vehicle is stopped, saving fuel and reducing pollution. The engine is automatically restarted when the driver gets ready to move again. (Start/Stop isn’t accounted in present EPA fuel mileage tests.) The ATS Coupe doesn’t offer an automatic engine start/stop system.

The 6 Series’ standard fuel tank has 2.5 gallons more fuel capacity than the ATS Coupe (18.5 vs. 16 gallons), for longer range between fill-ups. The 6 Series M6’s standard fuel tank has 5.1 gallons more fuel capacity than the ATS Coupe (21.1 vs. 16 gallons).

Brakes and Stopping Comparison

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


M6 Carbon Brakes

ATS Coupe

Front Rotors

13.7 inches

16.1 inches

12.6 inches

Rear Rotors

13.6 inches

15.6 inches

12.4 inches

Tires and Wheels Comparison

For better traction, the 6 Series has larger standard tires than the ATS Coupe (245/45R18 vs. 225/40R18). The M6’s tires are larger than the largest tires available on the ATS Coupe (F:265/40R19 & R:295/35R19 vs. F:225/40R18 & R:255/35R18).

The 6 Series’ optional 245/35R20 front and 275/30R20 rear tires provide better handling because they have a lower 35 series front and 30 series rear profile (height to width ratio) that provides a stiffer sidewall than the ATS Coupe’s 40 series front and 35 series rear tires.

For better ride, handling and brake cooling the 6 Series offers optional 20-inch wheels. The ATS Coupe’s largest wheels are only 18-inches.

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

Suspension and Handling Comparison

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

For a smoother ride and more stable handling, the 6 Series’ wheelbase is 3.1 inches longer than on the ATS Coupe (112.4 inches vs. 109.3 inches).

For better handling and stability, the average track (width between the wheels) on the 6 Series is 3 inches wider in the front and 2.9 inches wider in the rear than the track on the ATS Coupe.

Passenger Space Comparison

The 6 Series Coupe has 3.1 cubic feet more passenger volume than the ATS Coupe (87 vs. 83.9).

The 6 Series Coupe has 2.4 inches more front headroom, 2.8 inches more front shoulder room and .6 inches more rear headroom than the ATS Coupe.

Cargo Capacity Comparison

The 6 Series Coupe has a much larger trunk than the ATS Coupe (13 vs. 10.4 cubic feet).

Ergonomics Comparison

Unlike the driver-only memory system optional at extra cost in the ATS Coupe, the 6 Series offers an optional passenger memory, so that when drivers switch, the memory setting adjusts the driver’s seat, steering wheel position, outside mirror angle, climate settings and radio stations and the front passenger seat also adjusts to the new passenger’s preset preferences.

The 6 Series’ standard easy entry system raises the steering wheel, making it easier for the driver to get in and out. An easy entry system costs extra on the ATS Coupe.

If the windows are left down on the 6 Series the driver can raise them all using the key in the outside lock cylinder. On a hot day the driver can lower the windows from outside the vehicle using the key in the outside lock cylinder or the keyless remote. The driver of the ATS Coupe can only operate the windows from inside the vehicle, with the ignition on.

The 6 Series has a standard locking fuel door with a remote release located convenient to the driver. A locking fuel door helps prevent vandalism, such as sugar in the tank and fuel theft. The ATS Coupe doesn’t offer a locking fuel door.

The 6 Series’ rain-sensitive wipers adjust their speed and turn on and off automatically based on the amount of rainfall on the windshield. This allows the driver to concentrate on driving without constantly adjusting the wipers. The ATS Coupe’s standard manually variable intermittent wipers have to be constantly adjusted.

Heated windshield washer nozzles are standard on the 6 Series to prevent washer fluid and nozzles from freezing and help continue to keep the windshield clear in sub-freezing temperatures. The ATS Coupe doesn’t offer heated windshield washer nozzles.

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 has standard headlight washers to keep headlight output high. The ATS Coupe doesn’t offer headlight washers.

A power rear sunshade is optional in the 6 Series Coupe to help block heat and glare for the rear passengers. The ATS Coupe doesn’t offer a rear sunshade.

The 6 Series’ optional air conditioned front seats cool the driver and front passenger and help take the sting out of hot leather in Summer. The ATS Coupe doesn’t offer air conditioned front seats.

On extremely cold Winter days, the 6 Series’ optional heated steering wheel provides comfort, allowing the driver to steer safely and comfortably before the car heater warms up. The ATS Coupe doesn’t offer a heated steering wheel.

The 6 Series (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 ATS Coupe doesn’t offer an automated parking system.

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