For enhanced safety, the front and rear (child comfort guides) seat shoulder belts of the Buick LaCrosse are height-adjustable to accommodate a wide variety of driver and passenger heights. A better fit can prevent injuries and the increased comfort also encourages passengers to buckle up. The BMW 4 Series Gran Coupe doesn’t offer height-adjustable seat belts.
Over 200 people are killed each year when backed over by motor vehicles. The LaCrosse offers optional Rear Automatic Braking which use rear sensors to monitor and automatically apply the brakes to prevent a rear collision. The 4 Series Gran Coupe doesn’t offer backup collision prevention brakes.
To help make backing safer, the LaCrosse’s optional cross-path warning system uses wide-angle radar in the rear bumper to alert the driver to vehicles approaching from the side, helping the driver avoid collisions. The 4 Series Gran Coupe doesn’t offer a cross-path warning system.
Both the LaCrosse and the 4 Series Gran Coupe have standard driver and passenger frontal airbags, front side-impact airbags, side-impact head airbags, front seatbelt pretensioners, plastic fuel tanks, four-wheel antilock brakes, traction control and electronic stability systems to prevent skidding.
Buick’s powertrain warranty covers the LaCrosse 2 years and 20,000 miles longer than BMW covers the 4 Series Gran Coupe. Any repair needed on the engine, transmission, axles, joints or driveshafts is fully covered for 6 years or 70,000 miles. Coverage on the 4 Series Gran Coupe ends after only 4 years or 50,000 miles.
There are almost 8 times as many Buick dealers as there are BMW dealers, which makes it much easier should you ever need service under the LaCrosse’s warranty.
J.D. Power and Associates’ 2015 survey of the owners of three-year-old vehicles provides the long-term dependability statistics that show that Buick vehicles are more reliable than BMW vehicles. J.D. Power ranks Buick second in reliability, above the industry average. With 36 more problems per 100 vehicles, BMW is ranked 18th.
The LaCrosse’s optional 3.6 DOHC V6 produces 4 more horsepower (304 vs. 300) than the 435i Gran Coupe’s standard 3.0 turbo 6 cyl.
On the EPA test cycle the LaCrosse eAssist gets better fuel mileage than the 428i Gran Coupe RWD (25 city/36 hwy vs. 23 city/34 hwy).
To lower fuel costs and make buying fuel easier, the Buick LaCrosse uses regular unleaded gasoline. The 4 Series Gran Coupe requires premium, which can cost 20 to 55 cents more per gallon.
The LaCrosse V6 AWD’s standard fuel tank has 3.7 gallons more fuel capacity than the 4 Series Gran Coupe (19.5 vs. 15.8 gallons).
For better traction, the LaCrosse’s optional tires are larger than the largest tires available on the 4 Series Gran Coupe (245/45R19 vs. 225/45R18).
For better ride, handling and brake cooling the LaCrosse V6 offers optional 20-inch wheels. The 4 Series Gran Coupe’s largest wheels are only 19-inches.
For a smoother ride and more stable handling, the LaCrosse’s wheelbase is 1.1 inches longer than on the 4 Series Gran Coupe (111.7 inches vs. 110.6 inches).
The front grille of the LaCrosse uses electronically controlled shutters to close off airflow and reduce drag when less engine cooling is needed. This helps improve highway fuel economy. The 4 Series Gran Coupe doesn’t offer active grille shutters.
Because it has more passenger and cargo room, the LaCrosse is rated a Mid-size car by the EPA, while the 4 Series Gran Coupe is rated a Compact.
The LaCrosse has standard seating for 5 passengers; the 4 Series Gran Coupe can only carry 2.
The LaCrosse has 9.7 cubic feet more passenger volume than the 4 Series Gran Coupe (101.7 vs. 92).
The LaCrosse has .5 inches more front shoulder room, .2 inches more rear headroom and 6.8 inches more rear legroom than the 4 Series Gran Coupe.
The LaCrosse has a standard remote vehicle starting system, so the vehicle can be started from inside the driver's house. This allows the driver to comfortably warm up the engine before going out to the vehicle. The climate system will also automatically heat or cool the interior. The 4 Series Gran Coupe doesn’t offer a remote starting system.
The LaCrosse’s optional easy entry system glides the driver’s seat back when the door is unlocked or the ignition is switched off, making it easier for the driver to get in and out. The 4 Series Gran Coupe doesn’t offer an easy entry system.
To shield the driver and front passenger’s vision over a larger portion of the windshield and side windows, the LaCrosse has standard extendable sun visors. The 4 Series Gran Coupe doesn’t offer extendable visors.
The LaCrosse’s optional air conditioned front seats cool the driver and front passenger and help take the sting out of hot leather in Summer. The 4 Series Gran Coupe doesn’t offer air conditioned front seats.
The LaCrosse offers an optional 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 4 Series Gran Coupe doesn’t offer a house-current electrical outlet.
Consumer Reports® recommends the Buick LaCrosse, based on reliability, safety and performance.