2019 Cadillac XTS vs. 2018 Infiniti Q50

Detailed Review, Specifications & Comparison

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For enhanced safety, the front shoulder belts of the Cadillac XTS are height-adjustable, and the rear seat shoulder belts have child comfort guides to move the belt to properly fit children. A better fit can prevent injuries and the increased comfort also encourages children to buckle up. The Infiniti Q50 has only front height-adjustable seat belts.

Both the XTS and Q50 have child safety locks to prevent children from opening the rear doors. The XTS 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 Q50’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 XTS’ standard pretensioning seatbelts also sense rear collisions and remove slack from the front seatbelts to help protect the occupants from whiplash and other injuries. The Q50 doesn’t offer a whiplash protection system.

Both the XTS and the Q50 have standard driver and passenger frontal airbags, front side-impact 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 all-wheel drive, crash mitigating brakes, 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 Cadillac XTS is safer than the Infiniti Q50:





5 Stars

4 Stars




5 Stars

4 Stars




Neck Compression

11 lbs.

45 lbs.




5 Stars

3 Stars

Chest Compression

.4 inches

1 inches

Neck Injury Risk



Neck Stress

138 lbs.

145 lbs.

Neck Compression

56 lbs.

85 lbs.

Leg Forces (l/r)

206/282 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 Cadillac XTS is safer than the Infiniti Q50:





Front Seat


5 Stars

5 Stars

Chest Movement

.8 inches

.9 inches

Abdominal Force

148 G’s

262 G’s


Rear Seat


5 Stars

5 Stars




Spine Acceleration

42 G’s

46 G’s


Into Pole


5 Stars

5 Stars

Max Damage Depth

15 inches

19 inches

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


Cadillac pays for the first scheduled maintenance on the XTS. Cadillac will pay for an oil change, lubrication and any other required maintenance. Infiniti doesn’t pay scheduled maintenance for the Q50.

There are over 4 times as many Cadillac dealers as there are Infiniti dealers, which makes it much easier should you ever need service under the XTS’ warranty.


To reliably power the ignition and other systems and to recharge the battery, the XTS has a 170-amp alternator. The Q50’s standard 150-amp alternator isn’t as powerful.

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 Infiniti vehicles. J.D. Power ranks Cadillac 12th in initial quality, above the industry average. With 2 more problems per 100 vehicles, Infiniti is ranked 14th.


The XTS has more powerful engines than the Q50:





304 HP

264 lbs.-ft.

XTS V-Sport 3.6 turbo V6

410 HP

369 lbs.-ft.

Q50 2.0t 2.0 turbo 4 cyl.

208 HP

258 lbs.-ft.

Q50 3.0t 3.0 turbo V6

300 HP

295 lbs.-ft.

Q50 Hybrid 3.5 DOHC V6 hybrid

360 HP


Q50 Red Sport 400 3.0 turbo V6

400 HP

350 lbs.-ft.

Fuel Economy and Range

The XTS FWD’s standard fuel tank has 1.2 gallons more fuel capacity than the Q50 Hybrid’s standard fuel tank (19 vs. 17.8 gallons), for longer range between fill-ups.

The XTS 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 Q50 doesn’t offer a cap-less fueling system.

Brakes and Stopping

For better stopping power the XTS’ standard brake rotors are larger than those on the Q50:




Front Rotors

13.6 inches

12.6 inches

Rear Rotors

12.4 inches

12.1 inches

The XTS stops shorter than the Q50:





60 to 0 MPH (Wet)

134 feet

135 feet

Consumer Reports

Tires and Wheels

For better traction, the XTS has larger tires than the Q50 (245/45R19 vs. 225/55R17).

The XTS’ standard tires provide better handling because they have a lower 45 series profile (height to width ratio) that provides a stiffer sidewall than the Q50’s standard 55 series tires.

For better ride, handling and brake cooling the XTS has standard 19-inch wheels. Smaller 17-inch wheels are standard on the Q50. The XTS’ optional 20-inch wheels are larger than the 19-inch wheels optional on the Q50.

Suspension and Handling

The XTS has standard front gas-charged shocks for better control over choppy roads. The Q50’s suspension doesn’t offer gas-charged shocks.

The rear suspension of the XTS uses air springs for a smoother, controlled ride than the Q50, which uses coil springs. Air springs maintain proper ride height and ride more smoothly.

The XTS offers an optional automatic rear load leveling suspension to keep ride height level with a heavy load or when towing. The Q50 doesn’t offer a load leveling suspension.

For better handling and stability, the track (width between the wheels) on the XTS is 1.2 inches wider in the front and .5 inches wider in the rear than the average track on the Q50.

Passenger Space

Because it has more passenger and cargo room, the EPA rates the XTS a Large car, while the Q50 is rated a Mid-size.

The XTS has 2.7 cubic feet more passenger volume than the Q50 (104.2 vs. 101.5).

The XTS has 1.9 inches more front hip room, 1.2 inches more front shoulder room, .3 inches more rear headroom, 4.9 inches more rear legroom, 1.8 inches more rear hip room and .2 inches more rear shoulder room than the Q50.

Cargo Capacity

The XTS has a much larger trunk than the Q50 (18 vs. 13.2 cubic feet).

The XTS’ standard rear seats fold to accommodate long and bulky cargo. The Q50 Pure/Red Sport 400/Hybrid doesn’t offer folding rear seats.


The XTS has a 1000 lbs. towing capacity. The Q50 has no towing capacity.

Servicing Ease

The XTS has a maintenance free battery for long life without checking the battery’s water level. The Q50 doesn’t have a maintenance free battery, so the water level in the battery’s cells must be checked often to prevent damage.


Unlike the driver-only memory system optional at extra cost in the Q50 (except 2.0t), the XTS Premium/Platinum/V-Sport has a 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 XTS’ 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 Q50 does not have an oil pressure gauge.

The XTS Premium/Platinum/V-Sport has a standard heads-up display that projects speed and tachometer 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 XTS and the Q50 have locks to prevent small children from operating them. When the lock on the XTS 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 XTS to help block heat and glare for the rear passengers. The Q50 doesn’t offer a rear sunshade.

Both the XTS and the Q50 offer available heated front seats. The XTS also offers optional heated rear seats to keep those passengers extremely comfortable in the winter. Heated rear seats aren’t available in the Q50.

Optional air-conditioned seats in the XTS 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 XTS Premium/Platinum/V-Sport has a 115-volt a/c outlet on the center console, allowing you to recharge a laptop or run small household appliances without special adapters that can break or get misplaced. The Q50 doesn’t offer a house-current electrical outlet.

The XTS FWD’s optional 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 Q50 doesn’t offer an automated parking system.

Economic Advantages

Insurance will cost less for the XTS owner. The Complete Car Cost Guide estimates that insurance for the XTS will cost $1355 less than the Q50 over a five-year period.

According to The Car Book by Jack Gillis, the XTS is less expensive to operate than the Q50 because typical repairs cost much less on the XTS than the Q50, including $74 less for a starter, $20 less for fuel injection, $268 less for front struts and $68 less for a power steering pump.


The Car Book by Jack Gillis recommends the Cadillac XTS, based on economy, maintenance, safety and complaint levels. The Infiniti Q50 isn't recommended.

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

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