If ever there was a "star choice" model it has to be the R 320 CDI. The powerful three-litre V6 is a superb oil burner - smooth, quiet and good for an average 31mpg. On the road it handles the long-wheelbase R's bulk with little strain. There's a gruff engine note under hard acceleration, but at all other times the 224bhp unit with its 376lb/ft of torque is subdued and flexible. Maximum pulling power is available from just 1600rpm and peaks at 2800rpm - that gives the four-wheel drive monster brisk overtaking ability and an impressive 8.8 seconds for the 0-62mph sprint.
Mercedes will not sell many crossover R-Class people carriers, but a trend is being set for others to follow. Big, bulky and as spacious as an aircraft hangar, it's hardly a thing of beauty, but the R-Class is impeccably built and on the cusp of an entirely new sector.
The UK market is expected to consume no more than 2500 in a year, and of them 70% will be long-wheelbase versions, with 60% powered by Mercedes' outstanding R320 CDI turbo diesel. All R-Class models have 4Matic four-wheel drive and 7G-Tronic automatic seven-speed gearboxes. It's a match made in heaven and creates a six-seat luxury express which is part SUV, part 4x4 performance coupé and part estate.
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