Mercedes-Benz M-Class Problems

It's a topic of debate -- some would argue the Range Rover kicked off the prestige SUV craze 40 years ago.Others say SUVs aren't serious off-roaders and the modern category was established by ze Germans. It is the latter crowd that -- regardless of the origins of the species -- have come to dominate this prestige SUV segment.Be it an upper-crust shopping centre carpark or the leafy confines of a private school's grounds, you are guaranteed of spotting three particular vehicles -- the BMW X5, Audi's Q7 and examples of the Mercedes-Benz M-Class.The brand that has built its image on sheer driving pleasure and derivations therein has the X5 on its books, the benchmark in the class for on-road dynamics and some epic powerplants.The X5 sits behind only the 3 Series as BMW's top seller and is the best of its SUVs, fitted with six and eight cylinder petrol engines and six-cylinder turbo diesels.For those not concerned with fuel economy, the petrol V8s provide much in the way of propulsion and aural amusement but the oilers are the gems. The X5 has badge cred, car-like dynamics and family wagon versatility -- even a third-row option but space isn't abundant.Audi's Q7 has been outshone to some extent by the introduction of the smaller Q5, but the big Ingolstadt wagon has space aplenty. Among its petrol and turbo diesel engines, the 3.0-litre V6 oiler is the value pick. Not as nimble or car-like as the BMW, the Audi has a more useable third row of seats but lacks low-range.The M-Class is best off the beaten track, with an optional off-road package for the more serious adventurer. It has V6 petrol and turbo diesel, and V8 options including the super-quick ML63. As with the Audi, the V6 diesel is the best all-rounder.Last year the sales of large SUVs over $70,000 topped 17,000 , up 11 per cent. This year the segment is up more than 30 per cent with all three brands' SUVs selling strongly.Getting into one of these late-model beasts is relatively not expensive. Thanks to finance defaults, leased vehicles moving on and even trophy wives wanting something new, the "pre-owned'' market has no shortage of them, some with new car warranty remaining.Top TipsAs with all used cars, signs of poorly repaired accident damage (inconsistent welds, paint and panel fit) as well as signs of water intrusion (given recent flood events and submerged new car stocks) can point to rusty consequences.Diesel powerplants are generally more frugal when towing or on the open road but the fuel economy is offset by higher purchase price, service costs and the price of diesel. Do the numbers based on your driving habits (using urban and extra-urban fuel economy figures, not the combined-cycle number) and pick the appropriate machine.If you are hauling polo ponies, dressage nags, a boat or a van, check the towing capacity details, as some 4WDs make big boasts but fall over in real-world applications.2006 BMW X5 4.4Engine: 4.4-litre V8 petrolTransmission: 6-speed automaticThirst: 14.8L/100kmCARSGUIDE SAYSThe slogan "there's nothing quite like a V8'' applies here -- while the X5 has worthy diesels, the 4.4-litre V8 on offer in the big Beemer has appeal and when used sensibly won't drink ridiculous amounts of pulp. Leather trim, the full gamut of electronic safety gear and a clever all-wheel drivetrain make the big wagon more nimble than many passenger wagons and more than a few sedans.2008 AUDI Q7 3.0 TDIEngine: 3.0-litre V6 Turbo DieselTransmission: 6-speed automaticThirst: 10.5L/100kmCARSGUIDE SAYSThe V6 turbo diesel, one of the brand's better engines, deals well with the Audi's mass. Not as nimble as an X5 but far from a truck, the Q7 has a long features and safety equipment list plus leather trim. Tips the scales over two tonnes but can drag 3.5 tonnes when asked. There are bigger diesel and petrol engines but the 3.0-litre is a good all-rounder.2009 MERCEDES-BENZ ML 350 CDI WAGONEngine: 3-litre V6 turbo dieselTransmission: 7-speed automaticThirst: 9.6L/100kmCARSGUIDE SAYSUS-built -- as is the X5, which pipped the Benz by 49 sales last year -- the ML progressed significantly from the original M-Class, maintaining a greater off-road ability while closing the gap to the X5 in on-road dynamics. The badge holds plenty of cachet. There is an off-road pack with diff locks, low range, height-adjustable suspension and under-body protection.  

Mercedes-Benz was the first to hit the showrooms with a new prestige SUV, beating arch-rival BMW to market by a few months in 2000.

Britain’s Range Rover had the luxury 4WD market all to itself for many years until the Germans finally entered the arena. Led by the M-Class, Mercedes’ first luxury SUV, this market segment has become highly competitive. There are now also entrants from Mercedes’ biggest rivals, BMW and Audi.Mercedes-Benz M-Class arrived in Australia in September 1997 and has sold well since then thanks to a combination of image, price (more about this in a moment) and genuine 4WD ability. While the M-Class is used by most owners as a luxury station wagon rather than a 4WD, if you choose the right off-road packages it is pretty competent on unsealed surfaces.You wouldn't tackle Jeep’s Rubicon Trail in an M-Class, but it will cope with far tougher conditions than likely to be attempted by 99 per cent of owners. Why mention the famed ultra-tough Rubicon Trail? Because the Mercedes SUV was primarily aimed at the American market - and is made in the USA.Build quality was poor in the early days, but following some serious overhauls in the factory systems things improved greatly. Vehicles from the early 2000 update are noticeably better than the original units. The body on the original vehicle had a fair bit of movement, even squeaks and rattles in the really rough stuff, but was stiffened up for the year 2000 model.The high centre of gravity when compared to a car reduces the cornering ability of the big Mercedes 4WD on sealed roads. But electronic aids in the form of traction and stability controls make it cling to the road remarkably well. Amazingly, the big Merc M-class corners safely at speeds far higher than are likely to be attempted by the average owner.The generation-two models (W164) replaced the original W163 in October 2006 and the gen-three (W166) came to us in April 2012. Each version increased the stylishness of the vehicle, but put ever more emphasis on on-road performance. However, the Off-Road Pro packages are there for those who want to get down and dirty in the serious stuff.There's good interior space and the boot is a good size. As is the norm in the car business each model was larger than the previous, came with more a luxurious finish - and sold in greater numbers. Mercedes-Benz offers a staggering range of V6 and V8 petrol and engines. Diesels come with five or six cylinders, with the great majority featuring the V6 powerplants.Automatic transmissions are fitted to all vehicles, with five forward ratios in the early days and seven since the introduction of the W164 in 2006. At the top of the performance tree are the AMG variants of the M-Class. Improbable as they may seem, the ML 55 AMG and later the ML 63 AMG rocketships are much loved in Australia and ours is one of the world’s biggest market on a population basis.The Mercedes-Benz dealer network is very well established in Australia. Spare parts aren't overly expensive for what the vehicle is. Insurance charges are surprisingly moderate for an imported German luxury vehicle, reflecting some of the cost cutting that has gone into the manufacture of the M-class.Few vehicles are more popular on the Australian used-car market than Mercedes-Benzes with full service records. You will usually be asked to pay more, but wise men say they are well worth the additional money.If you don’t want to be seen driving a large 4WD why not consider a Mercedes-Benz R-Class. These are much more conventional-station wagon in appearance than the M-Class, but are driven by all four wheels and share many major components under the skin.WHAT TO LOOK FORVery few M-Class will have been used in serious off-road conditions; clues are light scratches to the body sides caused by squeezing past bushes and trees, scars on and/or under the bumper corners or scrapes on the underbody protection plates.Carting kids around the suburbs isn't all that easy on a 4WD, either. So have a good look over the interior, particularly at the seats, door pockets and the door controls.Make sure the engine starts easily, even the old-style turbo-diesels in the first models only take a second or two on the glow plugs.Check that the engine idles smoothly from the moment it fires up.On your road test make sure the engine pulls strongly without any initial hesitation, diesels won’t be as responsive as petrols but if you feel one is too slow to react be very careful.The automatic transmission should work almost imperceptibly, even when worked hard by the driver.Try engaging all the 4WD modes to make sure that they operate.Having done your preliminary inspections, always call on the services of a professional before committing yourself.CAR BUYING TIPAnyone buying an upmarket vehicle without a professional inspection - or a large budget on standby - is taking a major risk.