Mercedes R-class

The R-class’s strengths are its middle-row space and fully usable third row, but that’s about it

Published on May 29, 2011 07:00:00 AM

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Under the hood lies Merc’s familiar 3498cc, 272bhp petrol V6 that’s also in the E-class and S-class. It’s a twin-cam unit that breathes through four valves per cylinder and makes its peak torque of 35kgm all the way from 2400rpm to 5000rpm. Because this motor doesn’t have the instant torque of a diesel or even the new direct-injection petrol motors, it doesn’t feel quick or exciting when you put your foot down. The Merc GL 350 CDI is slightly slower to 100kph, but feels more lively because it makes so much more torque at lower revs.

The thing is, the engine has to haul over two tonnes of metal and occupants and so, straight-line performance is more stately than sprightly, which actually is fine for this kind of car. Still, the numbers suggest the car is quicker than it feels. Aided by the seven-speed auto, it will hit 100kph in just under 10sec and 180kph in 34sec, not bad for something so big and heavy. And, despite the large frontal area the R-class presents to the wind, it will go on to its top speed of 230kph. That said, the R-class motor pulls well all the way to its redline without complaint, staying incredibly smooth and making a sporty snarl along the way.

We didn’t expect brilliant economy from the big petrol engine and the sheer weight of the R-class. Not surprisingly, it guzzles a fair bit of fuel returning 5.4kpl in the city and 8.7kpl on the highway. It could have been worse if it weren’t for the R-class’s fast-shifting seven-speed gearbox.