Roomy, powerful and solidly built, the 2015 Mercedes-Benz GL-Class is one of the very best three-row crossover SUVs you can buy. The GL350 Bluetec and GL450 have different turbocharged V6 engines (one diesel, the other gasoline, respectively), but are otherwise similarly equipped with 19-inch alloy wheels, a self-leveling air suspension, automatic headlights, LED running lights, a sunroof, automatic wipers, roof rails, rear privacy glass, power rear quarter-windows and a power liftgate. Inside the standard features list continues with dual-zone automatic climate control, MB-Tex premium vinyl upholstery, heated eight-way power front seats (with four-way lumbar adjustment), a power-folding third-row seat, a rear cargo area cover, a leather-wrapped tilt-and-telescoping steering wheel and genuine wood interior trim. Electronic standard features include the knob-based COMAND interface, a 7-inch central display, a rearview camera, Bluetooth phone and audio connectivity, Mercedes mbrace2 emergency communications (including smartphone app integration), a 115-volt household-style power outlet and a sound system that features a CD/DVD player, HD radio, an auxiliary audio jack and a USB port. The Premium package for these two models adds power-folding exterior mirrors with driver-side auto-dimming, keyless ignition and entry, power front head restraints, memory settings for the driver and front passenger seats, a power-adjustable steering wheel, heated and cooled cupholders, lighted door sills and multicolor ambient lighting, an auto-dimming rearview mirror, a navigation system, traffic reporting, voice controls, 10GB of digital music storage, an iPod/media player interface and satellite radio. Standard safety features on the 2015 Mercedes-Benz GL-Class include antilock brakes, stability and traction control, automatic crosswind stabilization, trailer stability assist, front side airbags, full-length side curtain airbags, a driver knee airbag, active front head restraints, a f