Mercedes Benz

The 2016 Mercedes-Benz GL-Class is offered in four different models: the GL350 BlueTec, the GL450, the GL550 and the GL63 AMG. Engines are the key difference between the four: GL350 BlueTec models come with a 3.0L turbo-diesel V6 engine that makes 240 horsepower and 455 pound-feet of torque, while GL450 models include a new 3.0L turbocharged gasoline V6 that makes 362 hp and 369 lb-ft. GL550 models include a 4.6L V8 rated at 429 hp and 516 lb-ft, while the GL63 AMG gets a 5.5L bi-turbo V8 making 550 hp. The BlueTec diesel engine is one of the stars of the lineup, as it manages more low-rpm torque -- what matters for towing and full loads -- than the GL450 V6. Yet with EPA fuel economy ratings of 19 mpg city and 26 highway, this 7-passenger SUV is just as efficient as some much smaller crossovers. The diesel is also 50-state certified, thanks to a system that injects a urea solution Mercedes-Benz calls "AdBlue" into the exhaust flow. The new V6 delivers the same power as th...