Two models are on offer, a regular length version and a long wheelbase variant. It's tough making a case for the regular model. Yes, it looks a little neater in its proportioning but if you're spending this sort of money, it's worth going the whole hog and plumping for the long wheelbase variant. This is a vehicle that can genuinely seat six adults in comfort instead of relegating the final row of seats for children only.
Measuring fully 5,157mm from nose to tail in long wheelbase guise, there's nothing apologetic about the R-Class. In fact, it's even longer than an S-Class limousine but offers space for six inside, with around 64 per cent of the vehicle's body length available for its occupants. This is the sort of vehicle designed for customers who aren't accustomed to flying economy. The acid test for a vehicle with three rows of seats is the space from the second to third which in this case is up to 920mm. Moreover, the seats in the middle row can slide individually fore and aft, thereby increasing the seat spacing to as much as 990mm. No longer are the rear seats only suitable for the kids. Despite the swooping roofline, up to 1,027mm of rear headroom is available. The four rearmost seats also fold flat into the floor allowing the load capacity to expand to a massive 2,057 litres. Try finding an estate car that can match that.
A number of enticing options are offered, such as the remote control open and close function for the tailgate, the Luxury Climate Control with over a dozen sensors and a separate air-conditioning unit for the third row of seats. A separate DVD/CD player for the rear and a panoramic sunroof will also make you very popular with the offspring. The R-Class isn't all about the expensive options, however, and all models feature a very extensive standard equipment list.
The good thing about the R Class is that it was introduced in an era of ever improving build quality for Mercedes Benz. As such, not a lot goes wrong and all of the engines have solid reliability records. Many of the ancillary systems and parts are used elsewhere in the Mercedes range and have yet to generate complaints. As with a vehicle that's used for family duties, check that the rear seats and trims haven't been ravaged by demonic offspring and also ensure that the car hasn't been treated to any unsuitable off road excursions. Darker colours seem to be more in demand than pale hues. The R320CDI is especially popular given its miserly fuel economy and increasing popularity of executive diesels. A full Mercedes service history is also desirable, especially on recent examples which have very generous warranty and anti-corrosion cover.
(Based on a 2006 R500) Consumables for the R-Class are reasonably priced, with an air filter weighing in at £24, a fuel filter the best part of £60 and an oil filter a mere £6. Spark plugs are around £5 each, although tyres are expensive at around £140 per corner. One word of warning. When piloting your S-Class around narrow city streets think twice, before using the door mirrors as width indicators. They contain the side repeater mechanism and if you've got the auto-folding, self-dimming affairs, you'll be looking at around £350 if you knock one off.
Engine outputs range from 224bhp up to 306bhp, the V8 powerplant under the bonnet of the R500 propelling it from standstill to 60mph in just 6.6 seconds and on to a top speed of 149mph. Also to be found in the engine line-up is a six-cylinder diesel power unit with third-generation common-rail, direct-injection technology, whose credentials include improved fuel consumption, even lower exhaust emissions and an audible improvement in refinement. The V6 oil-burning engine places its class-beating peak torque of 510 Nm on tap from as low down as 1600 rpm. The average fuel consumption figures returned by the R320 CDI are no less astounding: 30.4mpg. The mainstream petrol-engined model is the R350, powered by a 272bhp V6 which will accelerate to 60mph in just 8 seconds and goes on to reach a top speed of 143 mph.
All engine models are partnered as standard by the 7G-TRONIC seven-speed automatic transmission, which itself comes with an interesting feature in the form of Direct Select. This electronic transmission control system has allowed Mercedes engineers to dispense with the conventional automatic selector lever in the centre console and to replace it instead with a lever on the steering column. Additional gearshift buttons on the steering wheel enable drivers to manually pre-select the seven forward gears, just like in a Formula One racing car. This allows the power reserves of the six and eight-cylinder engines to be harnessed to optimum effect in any driving situation.
Permanent all-wheel drive, the electronically controlled 4ETS traction system and ESP team up to offer peerless driving safety and keep the new R-Class safely on course, even in very bad road conditions. These systems all make up part of the vehicle's standard specification, as does air suspension at the rear axle.
Although the R-Class never really captured the public's imagination from new, the long wheelbase cars are well worth tracking down as a used proposition. These stretched models really do offer something over and above a usual estate without the lumbering bulk of a massive SUV. The long wheelbase R320 CDI is probably the pick of the pack, preferably in black.