2020 BMW 4 Series Gran Coupe vs. 2019 Infiniti Q70

Detailed Review, Specifications & Comparison

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Safety

Compared to metal, the 4 Series Gran Coupe’s plastic fuel tank can withstand harder, more intrusive impacts without leaking; this decreases the possibility of fire. The Infiniti Q70 has a metal gas tank.

Both the 4 Series Gran Coupe and the Q70 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, daytime running lights, rearview cameras, available all wheel drive and around view monitors.

Warranty

The 4 Series Gran Coupe’s corrosion warranty is 5 years longer than the Q70’s (12 vs. 7 years).

BMW pays for scheduled maintenance on the 4 Series Gran Coupe 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 Q70.

There are over 62 percent more BMW dealers than there are Infiniti dealers, which makes it much easier should you ever need service under the 4 Series Gran Coupe’s warranty.

Reliability

To reliably power the ignition and other systems and to recharge the battery, the 4 Series Gran Coupe has a standard 170-amp alternator. The Q70’s standard 130-amp alternator and largest (optional) 150-amp alternator aren’t as powerful.

The battery on the 4 Series Gran Coupe is in the trunk, which protects it from hot underhood temperatures that can degrade battery life. By keeping the 4 Series Gran Coupe’s battery 20 to 30 degrees cooler, its life is increased by years. The Q70’s battery is in the hot engine compartment.

J.D. Power and Associates rated the 4 Series Gran Coupe first among compact premium cars in their 2018 Initial Quality Study. The Q70 isn’t in the top three in its category.

J.D. Power and Associates’ 2018 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 11th in initial quality, above the industry average. With 5 more problems per 100 vehicles, Infiniti is ranked 14th.

J.D. Power and Associates’ 2019 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 7th in reliability, above the industry average. With 6 more problems per 100 vehicles, Infiniti is ranked 11th.

Engine

The 440i Gran Coupe’s standard 3.0 turbo 6 cyl. produces 60 lbs.-ft. more torque (330 vs. 270) than the Q70 3.7 LUXE’s standard 3.7 DOHC V6.

Fuel Economy and Range

On the EPA test cycle the 4 Series Gran Coupe gets better fuel mileage than the Q70:

MPG

4 Series Gran Coupe

RWD

430i 2.0 turbo 4 cyl.

23 city/34 hwy

440i 3.0 turbo 6 cyl.

22 city/30 hwy

AWD

430i 2.0 turbo 4 cyl.

21 city/31 hwy

440i 3.0 turbo 6 cyl.

22 city/30 hwy

Q70

RWD

3.7 DOHC V6

18 city/25 hwy

5.6 DOHC V8

16 city/24 hwy

AWD

3.7 DOHC V6

18 city/24 hwy

5.6 DOHC V8

16 city/23 hwy

Regenerative brakes improve the 4 Series Gran Coupe’s fuel efficiency by converting inertia back into energy instead of wasting it. The Q70 doesn’t offer a regenerative braking system.

In heavy traffic or at stoplights the 4 Series Gran Coupe’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. (Start/Stop isn’t accounted in present EPA fuel mileage tests.) The Q70 doesn’t offer an automatic engine start/stop system.

Transmission

An eight-speed automatic is standard on the BMW 4 Series Gran Coupe, for better acceleration and lower engine speed on the highway. Only a seven-speed automatic is available for the Q70.

Brakes and Stopping

The 4 Series Gran Coupe stops shorter than the Q70:

4 Series

Q70

70 to 0 MPH

162 feet

171 feet

Car and Driver

Tires and Wheels

The 4 Series Gran Coupe’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 Q70’s standard 50 series tires. The 4 Series Gran Coupe’s optional 255/35R19 rear tires have a lower 35 series profile than the Q70’s optional 40 series tires.

Changing a flat tire near traffic can be dangerous and inconvenient. The run-flat tires standard on the 4 Series Gran Coupe can be driven up to 50 miles without any air pressure, allowing you to drive to a service station for a repair. The Q70 doesn’t offer run-flat tires.

Suspension and Handling

The 4 Series Gran Coupe has standard front and rear gas-charged shocks for better control over choppy roads. The Q70’s suspension doesn’t offer gas-charged shocks.

The 4 Series Gran Coupe offers an available driver-adjustable suspension system. It allows the driver to choose between an extra-supple ride, reducing fatigue on long trips, or a sport setting, which allows maximum control for tricky roads. The Q70’s suspension doesn’t offer adjustable shock absorbers.

For better handling and stability, the average track (width between the wheels) on the 4 Series Gran Coupe is 1.1 inches wider in the rear than the average track on the Q70.

The 4 Series Gran Coupe’s front to rear weight distribution is more even (50.1% to 49.9%) than the Q70’s (53.8% to 46.2%). This gives the 4 Series Gran Coupe more stable handling and braking.

The 430i Gran Coupe handles at .89 G’s, while the Q70 3.7 LUXE pulls only .82 G’s of cornering force in a Car and Driver skidpad test.

Chassis

The 4 Series Gran Coupe is 1 foot, 1.4 inches shorter than the Q70, making the 4 Series Gran Coupe easier to handle, maneuver and park in tight spaces.

As tested by Car and Driver, the interior of the 430i Gran Coupe xDrive is quieter than the Q70 3.7 LUXE:

4 Series

Q70

Full-Throttle

73 dB

77 dB

70 MPH Cruising

65 dB

73 dB

Cargo Capacity

The 4 Series Gran Coupe has a larger trunk with its rear seat up than the Q70 (17 vs. 14.9 cubic feet).

The 4 Series Gran Coupe’s standard rear seats fold to accommodate long and bulky cargo. The Q70 doesn’t offer folding rear seats, only a ski pass-through.

To make loading and unloading groceries and cargo easier when your hands are full, the 4 Series Gran Coupe’s power liftgate can be opened or closed just by kicking your foot under the back bumper, leaving your hands completely free. The Q70 doesn’t offer a power or hands-free opening trunk.

Servicing Ease

The 4 Series Gran Coupe has a maintenance free battery for long life without checking the battery’s water level. The Q70 doesn’t have a maintenance free battery, so the water level in the battery’s cells must be checked often to prevent damage.

Ergonomics

The 4 Series Gran Coupe offers an optional heads-up display that projects speed and other key instrumentation readouts in front of the driver’s line of sight, allowing drivers to view information without diverting their eyes from the road. The Q70 doesn’t offer a heads-up display.

The power windows standard on both the 4 Series Gran Coupe and the Q70 have locks to prevent small children from operating them. When the lock on the 4 Series Gran Coupe is engaged the driver can still operate all of the windows, for instance to close one opened by a child. The Q70 prevents the driver from operating the other windows just as it does the other passengers.

The 4 Series Gran Coupe’s front and rear power windows all open or close fully with one touch of the switches, making it more convenient at drive-up windows and toll booths, or when talking with someone outside the car. The Q70’s rear power window switches have to be held the entire time to open or close them fully.

In poor weather, headlights can lose their effectiveness as grime builds up on their lenses. This can reduce visibility without the driver realizing. The 4 Series Gran Coupe offers available headlight washers to keep headlight output high. The Q70 doesn’t offer headlight washers.

While driving with high beams on, sensitive light sensors available for the 4 Series Gran Coupe detect other vehicles which could be blinded and automatically switch to low beams. The Q70 doesn’t offer automatic dimming high beams.

The 4 Series Gran Coupe’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 Q70 doesn’t offer an automated parking system.

Model Availability

The BMW 4 Series comes in coupe, convertible and four-door hatchback bodystyles; the Infiniti Q70 isn’t available as a coupe or convertible.

Economic Advantages

Insurance will cost less for the 4 Series Gran Coupe owner. The Complete Car Cost Guide estimates that insurance for the 4 Series Gran Coupe will cost $1345 less than the Q70 over a five-year period.

The 4 Series Gran Coupe will cost the buyer less in the long run because of its superior resale value. The IntelliChoice estimates that the 4 Series Gran Coupe will retain 47.49% to 50.4% of its original price after five years, while the Q70 only retains 39.81% to 42.73%.

According to The Car Book by Jack Gillis, the 4 Series Gran Coupe is less expensive to operate than the Q70 because typical repairs cost much less on the 4 Series Gran Coupe than the Q70, including $164 less for a fuel pump, $261 less for front struts, $119 less for a timing belt/chain and $557 less for a power steering pump.

IntelliChoice estimates that five-year ownership costs (depreciation, financing, insurance, fuel, fees, repairs and maintenance) for the BMW 4 Series Gran Coupe will be $10844 to $19079 less than for the Infiniti Q70.

Recommendations

The 4 Series was chosen as one of Car and Driver’s “Top Ten” in 2014. The Q70 has never been a Car and Driver “Top Ten” pick.

The 4 Series was chosen as one of Automobile Magazine’s “All Stars” in 2014. The Q70 has never been an “All Star.”

The BMW 4 Series outsold the Infiniti Q70 by over seven to one during 2018.

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

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