Certified Benz & Beemer Compares 2016 BMW M4 VS 2015 Maserati GranTurismo Near Phoenix, AZ

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2016 BMW M4

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2015 Maserati GranTurismo

Safety Comparison

The M4 offers optional City Collision Mitigation, which use forward mounted sensors to warn the driver of a possible collision ahead. If the driver doesn’t react and the system determines a collision is imminent, it automatically applies the brakes at full-force in order to reduce the force of the crash or avoid it altogether. The GranTurismo Convertible doesn't offer collision warning or crash mitigation brakes.

The M4’s optional lane departure warning system alerts a temporarily inattentive driver when the vehicle begins to leave its lane. The GranTurismo Convertible doesn’t offer a lane departure warning system.

The M4 offers optional Park Distance Control to help warn drivers about vehicles, pedestrians or other obstacles behind or in front of their vehicle. The M4 also offers an optional backup monitor to help drivers see any and all obstacles behind their vehicle, and an optional Side and Top View Cameras to allow the driver to see objects all around the vehicle. The GranTurismo Convertible doesn’t offer any parking assist system.

The M4’s optional blind spot warning system uses digital cameras monitored by computer to alert the driver to moving objects in the vehicle’s blind spots where the side view mirrors don’t reveal them. The GranTurismo Convertible doesn’t offer a system to reveal objects in the driver’s blind spots.

The M4 has standard BMW Assist, which uses a global positioning satellite (GPS) receiver and a cellular system to remotely unlock your doors if you lock your keys in, help track down your vehicle if it’s stolen or send emergency personnel to the scene if any airbags deploy. The GranTurismo Convertible doesn’t offer a GPS response system, only a navigation computer with no live response for emergencies, so if you’re involved in an accident and you’re incapacitated help may not come as quickly.

Both the M4 and the GranTurismo Convertible 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 and daytime running lights.

Warranty Comparison

The M4’s corrosion warranty is 8 years and unlimited miles longer than the GranTurismo Convertible’s (12/unlimited vs. 4/50,000).

BMW pays for scheduled maintenance on the M4 for 4 years and 50,000 miles. BMW will pay for oil changes, lubrication and any other required maintenance. Maserati doesn’t pay scheduled maintenance for the GranTurismo Convertible.

There are over 6 times as many BMW dealers as there are Maserati dealers, which makes it much easier should you ever need service under the M4’s warranty.

Engine Comparison

The M4’s 3.0 turbo 6 cyl. produces 30 lbs.-ft. more torque (406 vs. 376) than the GranTurismo Convertible Sport’s standard 4.7 DOHC V8. The M4’s 3.0 turbo 6 cyl. produces 22 lbs.-ft. more torque (406 vs. 384) than the GranTurismo Convertible Sport/MC’s standard 4.7 DOHC V8.

Fuel Economy and Range Comparison

On the EPA test cycle the M4 Auto gets better fuel mileage than the GranTurismo Convertible Sport Auto (17 city/24 hwy vs. 13 city/20 hwy).

In heavy traffic or at stoplights the M4’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 GranTurismo Convertible doesn’t offer an automatic engine start/stop system.

Brakes and Stopping Comparison

For better stopping power the M4’s brake rotors are larger than those on the GranTurismo Convertible:


M4 opt.


Front Rotors

15 inches

15.7 inches

14.2 inches

Rear Rotors

14.6 inches

15 inches

13 inches

The M4 offers optional heat-treated ceramic brake rotors, which last ten to twenty times as long as conventional cast iron rotors, don’t rust, don’t fade during repeated high speed braking, and their lighter weight contribute to better braking, handling and acceleration. The GranTurismo Convertible doesn’t offer ceramic brake rotors.

Tires and Wheels Comparison

For better traction, the M4 has larger front tires than the GranTurismo Convertible (255/40R18 vs. 245/35R20).

Suspension and Handling Comparison

The M4 offers an optional 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 GranTurismo Convertible’s suspension doesn’t offer adjustable shock absorbers.

Chassis Comparison

The BMW M4 may be more efficient, handle and accelerate better because it weighs about 250 to 850 pounds less than the Maserati GranTurismo Convertible.

The M4 is 10.3 inches shorter than the GranTurismo Convertible, making the M4 easier to handle, maneuver and park in tight spaces.

The M4’s standard power retractable hardtop allows a seamless transition from an open car, to a completely sealed coupe. The GranTurismo Convertible doesn’t offer a retractable hardtop.

Passenger Space Comparison

The M4 Convertible has 6 cubic feet more passenger volume than the GranTurismo Convertible (91 vs. 85).

Cargo Capacity Comparison

The M4 Convertible has a much larger trunk with its top down than the GranTurismo Convertible (7.8 vs. 6.1 cubic feet).

The M4’s standard rear seats fold to accommodate long and bulky cargo. The GranTurismo Convertible doesn’t offer folding rear seats.

To make loading groceries and cargo easier when your hands are full, the M4’s trunk can be opened just by kicking your foot under the back bumper, leaving your hands completely free. The GranTurismo Convertible doesn’t offer a hands-free gesture to open its trunk, forcing you to put cargo down if your hands are full.

Ergonomics Comparison

If the front windows are left down on the M4 the driver can raise them using the key in the outside lock cylinder. On a hot day the driver can lower the windows from outside the vehicle using the key in the outside lock cylinder or the keyless remote. The driver of the GranTurismo Convertible can only operate the windows from inside the vehicle, with the ignition on.

In case of a sudden change of weather, the M4 has a standard remote convertible top which can be raised from a distance to protect the interior of the vehicle from damage. The GranTurismo Convertible doesn’t offer a remote top, so the driver will have to run to the car, get in, turn the ignition on and raise the top to prevent the interior from being damaged.

Heated windshield washer nozzles are standard on the M4 to prevent washer fluid and nozzles from freezing and help continue to keep the windshield clear in sub-freezing temperatures. The GranTurismo Convertible doesn’t offer heated windshield washer nozzles.

While driving with high beams on, sensitive light sensors available for the M4 detect other vehicles which could be blinded and automatically switch to low beams. The GranTurismo Convertible doesn’t offer automatic dimming high beams.

When the M4 is put in reverse, the passenger rearview mirror tilts from its original position. This gives the driver a better view of the curb during parallel parking maneuvers. Shifting out of reverse puts the mirror into its original position. The GranTurismo Convertible’s mirror doesn’t automatically adjust for backing.

On extremely cold Winter days, the M4’s optional heated steering wheel provides comfort, allowing the driver to steer safely and comfortably before the car heater warms up. The GranTurismo Convertible doesn’t offer a heated steering wheel.

The M4’s standard steering wheel mounted cruise control is close at hand. The GranTurismo Convertible’s standard cruise control is on an over-crowded turn signal stalk.

Standard BMW Apps for the M4 allows the driver and passengers access to select programs on their smartphones, including reading text messages aloud, playing internet radio stations, tagging songs to buy them later, following twitter accounts and other connected activities without taking their eyes off the road or their hands from the wheel. The GranTurismo Convertible doesn’t offer factory integrated smartphone program access.

The M4’s standard GPS navigation system has a real-time traffic update feature that plots alternative routes to automatically bypass traffic problems. (Service not available in all areas.) The GranTurismo Convertible’s navigation system doesn’t offer real-time traffic updates.

The M4’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 GranTurismo Convertible doesn’t offer an automated parking system.

Recommendations Comparison

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

The M3/M4 was chosen as one of Automobile Magazine’s “All Stars” for 13 of the last 19 years. The GranTurismo Convertible has never been an “All Star.”

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