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| The Bottom Line | The cabin electronics and interface for the 2008 Mercedes-Benz GL320 CDI's infotainment system are old and have fallen far behind today's standards, but the diesel engine makes the car drive well and get incredible fuel economy for a full-size SUV. | The 2007 Mercedes-Benz ML320 CDI is a very drivable car, but you'll pay dearly to option it up with cabin electronics, should you live in a state where you can buy it. We're impressed by the off-road equipment, but who would really take this car into the mud? | The 2008 Mercedes-Benz ML550 is a brawny midsize SUV with some admirable on- and off-road performance capabilities. But its optional--and expensive--cabin technology lets it down. | The presence of the old iDrive interface makes it hard to recommend this generation of the BMW X5 xDrive35d, and the diesel engine makes it more suitable for open-road conditions than congested city traffic. | The 2007 GL450 is true to the Mercedes-Benz mission of performance and luxury; however, its plentiful cabin tech features are not as useful or usable as we would like. |
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| Drivetrain available | All-wheel drive | All-wheel drive | All-wheel drive | All-wheel drive | all-wheel drive |
| Available Engine | Diesel | Diesel | Gas | Diesel | Gas |
| Body style | SUV | SUV | SUV | SUV | SUV |
| Trim levels | GL320 CDI | ML320 CDI | ML550 | X5 | GL450 |
| Full specifications | Full specifications | Full specifications | Full specifications | Full specifications | Full specifications |
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