2019 Mercedes C-Class Sedan vs. 2019 Infiniti Q50

Detailed Review, Specifications & Comparison

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Safety

For enhanced safety, the front and rear seat shoulder belts of the Mercedes C-Class Sedan have pretensioners to tighten the seatbelts and eliminate dangerous slack in the event of a collision. The Infiniti Q50 doesn’t offer pretensioners for the rear seat belts.

The C-Class Sedan’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 Q50 doesn’t offer a driver alert monitor.

Both the C-Class Sedan and the Q50 have standard driver and passenger frontal airbags, front side-impact airbags, side-impact head airbags, height adjustable front shoulder belts, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, rearview cameras, available all wheel drive, lane departure warning systems, blind spot warning systems, around view monitors and rear cross-path warning.

The National Highway Traffic Safety Administration does 35 MPH front crash tests on new vehicles. In this test, results indicate that the Mercedes C-Class Sedan is safer than the Infiniti Q50:

 

C-Class Sedan

Q50

 

Driver

STARS

5 Stars

4 Stars

HIC

138

225

Neck Injury Risk

24%

24%

Neck Stress

203 lbs.

223 lbs.

 

Passenger

STARS

4 Stars

3 Stars

Chest Compression

.6 inches

1 inches

Leg Forces (l/r)

311/161 lbs.

541/294 lbs.

New test not comparable to pre-2011 test results. More stars = Better. Lower test results = Better.

The National Highway Traffic Safety Administration does side impact tests on new vehicles. In this test, which crashes the vehicle into a flat barrier at 38.5 MPH and into a post at 20 MPH, results indicate that the Mercedes C-Class Sedan is safer than the Infiniti Q50:

 

C-Class Sedan

Q50

 

Front Seat

STARS

5 Stars

5 Stars

HIC

76

79

Abdominal Force

147 G’s

262 G’s

 

Into Pole

STARS

5 Stars

5 Stars

Max Damage Depth

12 inches

19 inches

New test not comparable to pre-2011 test results. More stars = Better. Lower test results = Better.

For its top level performance in all IIHS frontal, side, rear impact and roof-crush tests, and with its optional front crash prevention system, the Insurance Institute for Highway Safety grants the C-Class Sedan the rating of “Top Pick” for 2017, a rating granted to only 139 vehicles tested by the IIHS. The Q50 has not been fully tested, yet.

Warranty

There are over 79 percent more Mercedes dealers than there are Infiniti dealers, which makes it much easier should you ever need service under the C-Class Sedan’s warranty.

Engine

The C-Class Sedan has more powerful engines than the Q50:

 

Horsepower

Torque

C 300 Sedan 2.0 turbo 4 cyl.

255 HP

273 lbs.-ft.

AMG C 43 Sedan 3.0 turbo V6

385 HP

384 lbs.-ft.

Q50 2.0t turbo 4 cyl.

208 HP

258 lbs.-ft.

Q50 3.0t turbo V6

300 HP

295 lbs.-ft.

Q50 Red Sport 400 3.0 turbo V6

400 HP

350 lbs.-ft.

Fuel Economy and Range

On the EPA test cycle the C-Class Sedan gets better fuel mileage than the Q50:

 

 

C-Class

Q50

 

RWD

300/Auto

23 city/34 hwy

23 city/30 hwy

2.0t/Auto

 

 

n/a

20 city/29 hwy

3.0t/Auto

 

 

n/a

20 city/26 hwy

Red Sport 400/Auto

AWD

300/Auto

22 city/33 hwy

22 city/28 hwy

2.0t/Auto

 

 

n/a

19 city/27 hwy

3.0t/Auto

 

 

n/a

19 city/26 hwy

Red Sport 400/Auto

Regardless of its engine, the C-Class Sedan’s engine automatically turns off when the vehicle is stopped, saving fuel and reducing pollution. (Start/Stop isn’t accounted in present EPA fuel mileage tests.) Infiniti only offers an automatic engine start/stop system on the Q50 2.0t.

Environmental Friendliness

In its Green Vehicle Guide, the U.S. Environmental Protection Agency (EPA) rates the Mercedes C-Class Sedan higher (5 out of 10) than the Infiniti Q50 (3). This means the C-Class Sedan produces up to 16.5 pounds less smog-producing pollutants than the Q50 every 15,000 miles.

Transmission

A nine-speed automatic is standard on the Mercedes C-Class Sedan, for better acceleration and lower engine speed on the highway. Only a seven-speed automatic is available for the Q50.

Brakes and Stopping

For better stopping power the C-Class Sedan’s front brake rotors are larger than those on the Q50:

 

C 300

AMG C 43

Q50

Q50 Sport

Front Rotors

13 inches

14.2 inches

12.6 inches

14 inches

The C-Class Sedan stops shorter than the Q50:

 

C-Class

Q50

 

70 to 0 MPH

160 feet

165 feet

Car and Driver

Tires and Wheels

The C-Class Sedan’s standard tires provide better handling because they have a lower 50 series profile (height to width ratio) that provides a stiffer sidewall than the Q50’s standard 55 series tires.

Suspension and Handling

For better handling and stability, the average track (width between the wheels) on the C-Class Sedan is 1.5 inches wider in the front than the average track on the Q50.

The AMG C 43 Sedan handles at .93 G’s, while the Q50 Red Sport 400 pulls only .88 G’s of cornering force in a Car and Driver skidpad test.

Chassis

The Mercedes C-Class Sedan may be more efficient, handle and accelerate better because it weighs about 250 pounds less than the Infiniti Q50.

The C-Class Sedan is 5.1 inches shorter than the Q50, making the C-Class Sedan easier to handle, maneuver and park in tight spaces.

The front grille of the C-Class Sedan uses electronically controlled shutters to close off airflow and reduce drag when less engine cooling is needed. This helps improve highway fuel economy. The Q50 doesn’t offer active grille shutters.

Cargo Capacity

The C-Class Sedan’s optional rear seats fold to accommodate long and bulky cargo. The Q50 Pure doesn’t offer folding rear seats.

To make loading and unloading groceries and cargo easier when your hands are full, the C-Class Sedan’s power trunk can be opened or closed just by kicking your foot under the back bumper, leaving your hands completely free. The Q50 doesn’t offer a power or hands-free opening trunk.

Ergonomics

Unlike the driver-only memory system optional at extra cost in the Q50 (except Pure/Luxe), the C-Class Sedan offers an optional passenger memory, so that when drivers switch, the memory setting adjusts the driver’s seat, steering wheel position and outside mirror angle and the front passenger seat also adjusts to the new passenger’s preset preferences.

The C-Class Sedan’s 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 Q50, and is not available on all models.

The C-Class Sedan offers an optional heads-up display that projects speed and navigation instruction readouts in front of the driver’s line of sight, allowing drivers to view information without diverting their eyes from the road. The Q50 doesn’t offer a heads-up display.

The power windows standard on both the C-Class Sedan and the Q50 have locks to prevent small children from operating them. When the lock on the C-Class Sedan is engaged the driver can still operate all of the windows, for instance to close one opened by a child. The Q50 prevents the driver from operating the other windows just as it does the other passengers.

A power rear sunshade is optional in the C-Class Sedan to help block heat and glare for the rear passengers. The Q50 doesn’t offer a rear sunshade.

Optional air-conditioned seats in the C-Class Sedan keep the driver and front passenger comfortable and take the sting out of hot seats in summer. The Q50 doesn’t offer air-conditioned seats.

The C-Class Sedan’s optional Active Parking Assist can parallel park or back into a parking spot by itself, with the driver only controlling speed with the brake pedal. The Q50 doesn’t offer an automated parking system.

Model Availability

The Mercedes C-Class comes in coupe, convertible and sedan bodystyles; the Infiniti Q50 isn’t available as a coupe or convertible.

Economic Advantages

According to The Car Book by Jack Gillis, the C-Class Sedan is less expensive to operate than the Q50 because typical repairs cost much less on the C-Class Sedan than the Q50, including $59 less for fuel injection, $124 less for front struts, $339 less for a timing belt/chain and $379 less for a power steering pump.

Recommendations

The C-Class Sedan was chosen as one of Automobile Magazine’s “All Stars” in 2015. The Q50 has never been an “All Star.”

The Mercedes C-Class outsold the Infiniti Q50 by 56% during the 2018 model year.

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

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