Used 2009 Mercedes-Benz R-Class Pricing

To its credit, the Bluetec engine performs well enough, and the R320 is generally a pleasant vehicle, whether you're driving or riding. But we're afraid those well-heeled parents have already voted with their wallets — the R-Class simply isn't what wealthy shoppers want for their family transportation needs.

Performance

The all-wheel-drive 2009 Mercedes-Benz R320 Bluetec is motivated by a 3.0-liter turbodiesel V6 that was engineered expressly to achieve 50-state emissions certification. To make a complicated story simple, Mercedes' solution was to add a tank of urea and water mixture to the exhaust system. When the engine is running, this mixture is automatically injected into the exhaust stream, catalyzing a chain reaction that results in the conversion of polluting nitrogen oxides into harmless water vapor and nitrogen.

The Bluetec V6 cranks out 210 horsepower and 398 pound-feet of torque, the latter of which is available from 1,600-2,400 rpm. A seven-speed automatic with manual-shift capability — the only available transmission — routes this power to all four wheels via Mercedes' 4Matic system, which lacks low-range gearing in this application. At our test track, the portly 5,537-pound R320 galloped from zero to 60 mph in an unremarkable 8.8 seconds. Stopping distances were superlative for such a gargantuan vehicle, with a best stop of just 122 feet from 60 mph.

The diesel power plant is unfortunately a mixed bag. You can't ignore 398 lb-ft of torque, of course — the R320 really lunges forward once the Bluetec is on boil. However, it takes far too long for the transmission to act when you floor the gas from a stop. There's an exasperating delay (one-one thousand...) while the seven-speed slushbox unhurriedly mulls over your command, rather than the instantaneous turbodiesel torque we'd expect.

When the going got twisty, the R320 reminded us that it's no sport wagon, yet it surprised us with its refined road manners. A slalom speed of 58.1 mph might not be very impressive — indeed, it's more than 4 mph slower than the ML320 — but the big Benz handles high-speed sweepers with unexpected athleticism. The R320's steering is another point in its favor, as it's significantly more responsive and precise than the ML's gooey rack. The Airmatic electronically adjustable suspension seemed gimmicky, however, as switching from "Comfort" to "Sport" merely increased impact harshness without noticeably reducing body roll.

EPA fuel economy estimates for the 2009 Mercedes-Benz R320 stand at 18 mpg city/24 highway and 20 combined. We recorded 20.8 mpg over about 1,100 miles of mixed driving.

Comfort

The R320 rides firmly, even a bit harshly on occasion. More diesel clatter makes its way into the cabin than we'd like during part-throttle acceleration, and road noise was a mild annoyance over certain surfaces. As a highway cruiser, however, this outsized wagon is wunderbar. The power-adjustable, leather-trimmed front seats are superbly supportive, and the R320's prodigious length and steeply raked windshield made us feel as though we were piloting our own personal high-speed train. Speaking of high speeds, that's where the R320 thrives — American speed limits are quite simply an insult to its autobahn breeding.

Passengers in our test car's spacious second row were treated to their own climate controls and a glass roof, as well as coddling seats that wouldn't have looked out of place in a private jet. Even the optional middle seat is hospitable for an adult, though it impinges on third-row knee room when locked in place. If the middle seat isn't occupied, it can spring forward to a less obtrusive location, enabling two adults to fit in the third row with ease. However, there's no substitute for sliding doors in terms of convenience, especially in tight parking lots, no matter how wide the R320's stretched conventional rear doors may open.

Function

Visibility in the 2009 Mercedes-Benz R320 is excellent, with glass galore and a commanding driving position. The center stack controls are annoyingly labor-intensive, however, as the R320's COMAND interface lacks the control knob we've come to expect in premium vehicles, forcing you to use four directional arrow keys and an "OK" button instead. Compounding the problem is the smorgasbord of identical-looking black buttons surrounding the COMAND screen.

On the bright side, there's a nifty two-mode switch mounted on the inside lip of the power tailgate — the first function closes the tailgate, while the second closes it and then locks the entire vehicle. The sound quality of the optional Harman Kardon Logic7 stereo is good, if not great, and we appreciated this system's up-to-date technology, from its nicely integrated iPod interface to its hard-drive-based music storage.

In our real-world usability tests, a child safety seat fits easily in the R320's capacious second row, and our standard suitcase was a cinch to stow behind the third row. However, if you want to put a golf bag back there, you'll have to fold down at least one of those third-row seats manually, which requires a rather undignified amount of elbow grease.

Design/Fit and Finish

The R-Class' unusual exterior styling is perhaps one of its chief drawbacks beyond its price. The interior, on the other hand, is absolutely top-notch, with expensive-looking and -feeling materials just about everywhere. Even the glovebox door is covered in soft-touch material, for goodness' sake. Fit and finish was generally good on our test car, though we did notice a persistent rattle in the steering column.

Who should consider this vehicle

Those who don't mind paying through the nose in order to transport up to seven passengers in extraordinary comfort — and like the idea of using less of a finite resource than the gas-powered version.

Others To Consider
Honda Odyssey, Mercedes-Benz GL320 Bluetec, Toyota Sienna.

The manufacturer provided Edmunds this vehicle for the purposes of evaluation.