Compare the2022 BMW 3 Series SedanVS 2022 Infiniti Q50

The BMW 3 Series Sedan has standard driver and front passenger side knee airbags mounted low on the dashboard. These airbags helps prevent the driver and front passenger from sliding under their seatbelts or the main frontal airbags; this keeps them better positioned during a collision for maximum protection. Knee airbags also help keep the legs from striking the dashboard, preventing knee and leg injuries in the case of a serious frontal collision. The Q50 doesn’t offer knee airbags.

The 3 Series Sedan 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 Q50 doesn’t offer a whiplash protection system.

The 3 Series Sedan has a standard PostCrash iBrake, which automatically applies the brakes in the event of a crash to help prevent secondary collisions and prevent further injuries. The Q50 doesn’t offer a post collision braking system: in the event of a collision that triggers the airbags, more collisions are possible without the protection of airbags that may have already deployed.

The 3 Series 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 3 Series Sedan and the Q50 have standard driver and passenger frontal airbags, front side-impact airbags, side-impact head airbags, front seatbelt pretensioners, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, lane departure warning systems, rearview cameras, available all wheel drive, blind spot warning systems, rear parking sensors and rear cross-path warning.

For its top level performance in IIHS driver and passenger-side small overlap frontal, moderate overlap frontal, side impact, roof strength and head restraint tests, its standard vehicle-to-vehicle front crash prevention system, its standard vehicle-to-pedestrian front crash prevention system, and its available headlight’s “Good” rating, the Insurance Institute for Highway Safety grants the 3 Series Sedan the rating of “Top Pick” for 2021, a rating granted to only 130 vehicles tested by the IIHS. The Q50 has not been fully tested, yet.

The 3 Series Sedan’s corrosion warranty is 5 years longer than the Q50’s (12 vs. 7 years).

BMW pays for scheduled maintenance on the 3 Series Sedan for 3 years and 36,000 miles. BMW will pay for oil changes, lubrication and any other required maintenance. Infiniti doesn’t pay scheduled maintenance for the Q50.

There are over 71 percent more BMW dealers than there are Infiniti dealers, which makes it much easier should you ever need service under the 3 Series Sedan’s warranty.

The battery on the 3 Series Sedan is in the trunk, which protects it from hot underhood temperatures that can degrade battery life. By keeping the 3 Series Sedan’s battery 20 to 30 degrees cooler, its life is increased by years. The Q50’s battery is in the hot engine compartment.

J.D. Power and Associates’ 2021 Initial Quality Study of new car owners surveyed provide the statistics that show that BMW vehicles are better in initial quality than Infiniti vehicles. J.D. Power ranks BMW 20th in initial quality. With 4 more problems per 100 vehicles, Infiniti is ranked 21st.

J.D. Power and Associates’ 2021 survey of the owners of three-year-old vehicles provides the long-term dependability statistics that show that BMW vehicles are more reliable than Infiniti vehicles. J.D. Power ranks BMW 10th in reliability, above the industry average. With 29 more problems per 100 vehicles, Infiniti is ranked 23rd.

The M340i’s standard 3.0 turbo 6-cylinder hybrid produces 18 lbs.-ft. more torque (368 vs. 350) than the Q50 Red Sport 400’s standard 3.0 turbo V6.

As tested in Car and Driver the M340i 3.0 turbo 6-cylinder hybrid is faster than the Q50 Red Sport 400:

On the EPA test cycle the 3 Series Sedan gets better mileage than the Q50:

Regenerative brakes improve the 3 Series Sedan’s fuel efficiency by converting inertia back into energy instead of wasting it. The Q50 doesn’t offer a regenerative braking system.

In heavy traffic or at stoplights the 3 Series Sedan’s 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. If the conditions warrant or the driver wishes, the system can be manually disabled at any time for the duration of a trip. The Q50 doesn’t offer an automatic engine start/stop system.

In its Green Vehicle Guide, the U.S. Environmental Protection Agency (EPA) rates the BMW 3 Series Sedan higher (5 to 7 out of 10) than the Infiniti Q50 (3). This means the 3 Series Sedan produces up to 24.5 pounds less smog-producing pollutants than the Q50 every 15,000 miles.

An eight-speed automatic is standard on the BMW 3 Series Sedan, for better acceleration and lower engine speed on the highway. Only a seven-speed automatic is available for the Q50.

The 3 Series Sedan’s launch control uses engine electronics to hold engine RPM’s precisely in order to provide the most stable and rapid acceleration possible, using all of the available traction. The Q50 doesn’t offer launch control.

For better stopping power the 3 Series Sedan’s standard brake rotors are larger than those on the Q50:

The 3 Series Sedan stops much shorter than the Q50:

The 330i’s 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 Luxe’s standard 50 series tires. The 3 Series Sedan’s optional 225/35R20 front and 255/30R20 rear tires have a lower 35 series front and 30 series rear profile than the Q50 Red Sport 400’s 40 series front and 35 series rear tires.

For better ride, handling and brake cooling the 3 Series Sedan offers optional 20-inch wheels. The Q50’s largest wheels are only 19-inches.

The 3 Series Sedan has standard front and rear gas-charged shocks for better control over choppy roads. The Q50’s suspension doesn’t offer gas-charged shocks.

For better handling and stability, the average track (width between the wheels) on the 3 Series Sedan is 1.8 inches wider in the front and 1.5 inches wider in the rear than the average track on the Q50.

The 3 Series Sedan’s front to rear weight distribution is more even (51.3% to 48.7%) than the Q50’s (55.8% to 44.2%). This gives the 3 Series Sedan more stable handling and braking.

The 330i handles at .99 G’s, while the Q50 Red Sport 400 pulls only .88 G’s of cornering force in a Car and Driver skidpad test.

The 3 Series Sedan is 3.9 inches shorter than the Q50, making the 3 Series Sedan easier to handle, maneuver and park in tight spaces.

The design of the BMW 3 Series Sedan amounts to more than styling. The 3 Series Sedan has an aerodynamic coefficient of drag of .26 Cd. That is lower than the Q50 (.26 to .29) and many sports cars. A more efficient exterior helps keep the interior quieter and helps the 3 Series Sedan get better fuel mileage.

The front grille of the 3 Series 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.

The 3 Series Sedan has .8 inches more rear headroom and .1 inches more rear legroom than the Q50.

Pulling a handle automatically lowers the 3 Series Sedan’s rear seats, to make changing between passengers and cargo easier. The Q50 doesn’t offer automatic folding seats.

To make loading and unloading groceries and cargo easier, especially for short adults, the 3 Series Sedan offers an optional power trunk, which opens and closes automatically by pressing a button, or optionally by just kicking your foot under the back bumper, completely leaving your hands free. The Q50 doesn’t offer a power trunk.

The 3 Series Sedan offers an optional heads-up display that projects speed, warning 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 3 Series Sedan’s power parking brake sets with one touch and releases with one touch or automatically. The Q50’s parking brake has to released manually.

The power windows standard on both the 3 Series Sedan and the Q50 have locks to prevent small children from operating them. When the lock on the 3 Series 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.

The Insurance Institute for Highway Safety (IIHS) conducts detailed tests on headlights for their range both straight ahead and in curves and to be certain they don’t exceed acceptable amounts of glare to oncoming drivers. The 3 Series Sedan’s available headlights were rated “Good” by the IIHS, while the Q50’s headlights are rated “Acceptable” to “Marginal.”

Both the 3 Series Sedan and the Q50 offer available heated front seats. The 3 Series Sedan also offers optional heated rear seats to keep those passengers extremely comfortable in the winter. Heated rear seats aren’t available in the Q50.

According to The Car Book by Jack Gillis, the 3 Series Sedan is less expensive to operate than the Q50 because typical repairs cost much less on the 3 Series Sedan than the Q50, including $227 less for a fuel pump and $533 less for a power steering pump.

Consumer Reports® recommends both the BMW 3 Series Sedan and the Infiniti Q50, based on reliability, safety and performance.