2019 Cadillac CT6 vs. 2019 Mercedes E-Class Sedan

Detailed Review, Specifications & Comparison

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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 E-Class Sedan doesn’t offer a back seat reminder.

Over 200 people are killed each year when backed over by motor vehicles. The CT6 Premium Luxury/Platinum/Sport has standard Reverse Automatic Braking that uses rear sensors to monitor and automatically apply the brakes to prevent a rear collision. The E-Class Sedan doesn’t offer backup collision prevention brakes.

An active infrared night vision system optional on the CT6 helps the driver to more easily detect people, animals or other objects in front of the vehicle at night. Using an infrared camera and near-infrared lights to detect heat, the system then displays the image on a monitor in the dashboard. The E-Class Sedan doesn’t offer a night vision system.

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


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

The CT6’s corrosion warranty is 1 year longer than the E-Class Sedan’s (6 vs. 5 years).

Cadillac pays for the first scheduled maintenance on the CT6. Cadillac will pay for an oil change, lubrication and any other required maintenance. Mercedes doesn’t pay scheduled maintenance for the E-Class Sedan.

There are over 2 times as many Cadillac dealers as there are Mercedes dealers, which makes it much easier should you ever need service under the CT6’s warranty.


J.D. Power and Associates’ 2018 Initial Quality Study of new car owners surveyed provide the statistics that show that Cadillac vehicles are better in initial quality than Mercedes vehicles. J.D. Power ranks Cadillac 12th in initial quality, above the industry average. With 2 more problems per 100 vehicles, Mercedes is ranked 14th.


The CT6 has more powerful engines than the E-Class Sedan:




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.

CT6 V-Sport 4.2 turbo V8

550 HP

627 lbs.-ft.

E 300 Sedan 2.0 turbo 4 cyl.

241 HP

273 lbs.-ft.

E 450 4MATIC Sedan 3.0 turbo V6

362 HP

369 lbs.-ft.

AMG E 53 Sedan 3.0 turbo 6 cyl. hybrid

429 HP

384 lbs.-ft.

As tested in Car and Driver the Cadillac CT6 2.0 Turbo is faster than the E 300 Sedan:




Zero to 30 MPH

1.9 sec

2.2 sec

Zero to 60 MPH

6.1 sec

6.5 sec

Zero to 80 MPH

10.8 sec

11.2 sec

Zero to 100 MPH

17.6 sec

17.7 sec

5 to 60 MPH Rolling Start

7 sec

7.3 sec

Passing 30 to 50 MPH

3.7 sec

3.9 sec

Passing 50 to 70 MPH

4.4 sec

5 sec

Quarter Mile

14.7 sec

15 sec

Top Speed

149 MPH

129 MPH

Fuel Economy and Range

On the EPA test cycle the CT6 RWD 2.0 Turbo gets better fuel mileage than the E 300 RWD Sedan (24 city/34 hwy vs. 22 city/30 hwy).

An engine control system that can shut down half of the engine’s cylinders helps improve the CT6 V6/V8’s fuel efficiency. The E-Class Sedan doesn’t offer a system that can shut down part of the engine.

The CT6 has 2.1 gallons more fuel capacity than the E-Class Sedan 300’s standard fuel tank (19.5 vs. 17.4 gallons), for longer range between fill-ups.

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 E-Class Sedan doesn’t offer a cap-less fueling system.


A 10-speed automatic is standard on the Cadillac CT6, for better acceleration and lower engine speed on the highway. Only a nine-speed automatic is available for the E-Class Sedan.

Brakes and Stopping

The CT6 stops shorter than the E-Class Sedan:



E-Class Sedan


70 to 0 MPH

152 feet

161 feet

Car and Driver

60 to 0 MPH

106 feet

110 feet

Motor Trend

Tires and Wheels

For better ride, handling and brake cooling the CT6 offers optional 20-inch wheels. The E-Class Sedan’s largest wheels are only 19-inches.

The CT6 has a standard space-saver spare tire so you can replace a flat tire and drive to have the flat repaired or replaced. A spare tire isn’t available on the E-Class Sedan; it requires you to depend on its run-flat tires, which limits mileage and speed before they are repaired. If a run-flat is damaged beyond repair by a road hazard your vehicle will have to be towed. Some models of the E-Class Sedan don’t even offer run-flats.

Suspension and Handling

For a smoother ride and more stable handling, the CT6’s wheelbase is 6.7 inches longer than on the E-Class Sedan (122.4 inches vs. 115.7 inches).

The CT6 AWD executes Motor Trend’s “Figure Eight” maneuver quicker than the E 300 Sedan (25.4 seconds @ .75 average G’s vs. 25.8 seconds @ .7 average G’s).


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 E-Class Sedan doesn’t offer active grille shutters.

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

As tested by Car and Driver while under full throttle, the interior of the CT6 is quieter than the E 300 Sedan 4MATIC (72 vs. 76 dB).

Passenger Space

Because it has more passenger and cargo room, the EPA rates the CT6 a Large car, while the E-Class Sedan is rated a Mid-size.

The CT6 has 23.2 cubic feet more passenger volume than the E-Class Sedan (121.2 vs. 98).

The CT6 has 2.8 inches more front headroom, 4.7 inches more front legroom, .5 inches more front shoulder room and 4.2 inches more rear legroom than the E-Class Sedan.

For enhanced passenger comfort on long trips the CT6’s available rear seats recline. The E-Class Sedan’s rear seats don’t recline.

Cargo Capacity

The CT6 has a much larger trunk than the E-Class Sedan (15.8 vs. 13.1 cubic feet).

Servicing Ease

J.D. Power and Associates surveys of service recipients show that Cadillac service is better than Mercedes. J.D. Power ranks Cadillac third in service department satisfaction. With a 3% lower rating, Mercedes is ranked 6th.


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 E-Class Sedan does not have an oil pressure gauge.

Both the CT6 and the E-Class Sedan offer optional heated front seats. The CT6 also offers optional heated rear seats to keep those passengers extremely comfortable in the winter. Heated rear seats aren’t available in the E-Class Sedan.

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

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

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