Expert answer

Hi Patsy,

BMW offers three different diesel engines with xDrive four-wheel drive in the X3, the xDrive20d, xDrive30d and xDrive35d. The xDrive20d can be had with a manual or automatic gearbox and the official figure is 50.4mpg (5.6 litres/100km) no matter which transmission is fitted. The xDrive30d and xDrive35d are only available with automatic gearboxes and the official fuel economy figures are 47.1mpg and 46.3mpg respectively (6.0- and 6.1 litres/100km).

Those figures won't be obtainable in the real-world, obviously! We spent time with the xDrive20d during snowy conditions a few years back (read the full review here) and averaged 34mpg (8.3 litres/100km), though in normal conditions it should do a lot better than that. We also tested the xDrive30d (read that full review here), though apologies, but I didn't record the average fuel consumption figure at the time...

Expert answer

Hi Martin,

You're in an enviable position and, before going into more detail, we'd be very happy with any of those cars as an ownership proposition.

Personally, I'd be sorely tempted by the Evoque. There are plenty of colour and wheel options to change its appearance to your liking, it's much more of an occasion inside and it drives like a hot hatch (the chassis is very much road-biased, though it does well enough off-road when needed). Admittedly, certain versions of the BMW and Audi may be more economical, but I'd look at it very closely.

When the current BMW X3 came out it really took a leap forward from its predecessor in terms of comfort, quality and refinement, but between that and the Audi Q5 I may too be swayed by the fact that the Audi has had a more recent update. I also prefer how the Q5 looks. There's very little between them depending on which engines you're looking at.

The best advice is to go test drive each car for as long as possible, paying close attention to the specifications of the test cars.

In terms of automatic gearboxes, unless you're looking at a petrol Q5 (which I doubt!) or the high-performance SQ5 TDI model (fantastic) then the only option is the dual-clutch S-Tronic unit. This helps with efficiency and allows the driver more control when he wants it, but is not as smooth as a traditional torque converter gearbox, as fitted to the Evoque and BMW. They're both smooth systems, but the eight-speed item in the BMW is the most impressive, managing to minimise fuel consumption increases.

Hopefully that's of help, but come back to us if you need more

Expert answer

Hi Frank,

The new-shape BMW 5 Series is a fabulous car, especially if it has the right equipment, such as a leather interior, etc. The 520d is nothing short of fantastic when new, though we've heard reports that this 2.0-litre turbodiesel engine can have expensive problems as it gets older - especially if oil maintenance is not adhered to strictly. If the one you're looking at has a detailed service history then there's less worry.

However, if you do very small mileage we'd question why you're going for a diesel car at all. The fuel economy might be tempting, but you should look around and see what petrol models you can get for your money too, as modern petrol engines are improving in terms of fuel economy and emissions - and they're generally cheaper to buy and maintain. They're also quieter and far better suited to low mileage use.

Let us know how you get on

Expert answer

Hi Celsus,

As an overview, Skoda's cars are all reliable, quite comfortable and generally economical. Bigger wheels reduce comfort and the Yeti is less 'soft' on the road than say the Octavia and Superb. Most people stick with the diesel engines, which are very efficient.

If you'd like us to comment on something specific please come back to us.

Expert answer

Hi Pat,

They're generally quite solid, but there are a few crucial checks to make. Alternator belts can wear and make a horrible screeching noise when they do. The HDi engines need an additive put in at 60-80,000-mile intervals. A heavy clutch pedal may mean clutch failure is imminent. There are diesel particulate filter issues - if the DPF light comes on and stays on, run the car at medium revs in a low gear for several kilometres to try and heat up the exhaust enough to burn out soot from the DPF. If that doesn't work, it's an expensive part to have replaced. Dual-mass flywheels can get warped and cause a juddering effect. A lumpy idle or excessive exhaust smoke may mean that the exhaust gas recirculation valve needs replacing. 

Inside, the radio and its LED screen can be fragile while, if the air conditioning isn't puffing hard enough, it usually means that the pollen filter needs emptying. Underneath, watch for the front suspension being out of alignment and for excessive tyre wear - 407s were always quite hard on their tyres. A groaning power steering system means the pump needs replacing too.

Expert answer

Hi Eddie,

Surprisingly, there are a few recurrent problems. If it's got a sunroof, check for rust around the edges. Engines need a cambelt change every 60,000 miles. A metallic whirring noise means there's pinking going on and you may need a replacement ECU. The crankshaft oil seal can leak, while clutches tend to go after six to seven years. Distributor caps and HT leads are both rather fragile. The CV gaiters on the driveshafts often crack and leak.

That's about it though. Pretty solid car.

Expert answer

Hi Patrick,

It should be fine, as it was the four-cylinder diesel that was troublesome on the E60 5 Series, and the straight-six engines are pretty solid. Just make sure that it has a full and complete service history and, if there are any gaps in the maintenance, walk away.

Expert answer

Hi Keith,

No, it's not a waste of time at all. It's almost always better value to keep and fix an existing car rather than pay the cost-of-change to upgrade to something newer. That said, if you're convinced you need a better solution, then you won't do better than to go for one of the many car-vans on offer now. The Renault Kangoo and Citroen Berlingo are the best known versions, but there are also similar models available from Fiat, Volkswagen and Peugeot.  My personal pick would be the Fiat Doblo, fitted with the 1.6- or 1.3-litre MultiJet diesel engines. You'll find the cabin surprisingly comfy, it's quite pleasant to drive, very economical and good on tax and massively spacious in the back. There's even a seven-seat version available if you want to be really popular at the school gate.

Expert answer

Hi Catherine,

A rough estimate of your C4's value should give you a budget of around €12,000 (and you might even do a bit better than that if you're lucky). Even at that level though, there is a plethora of cars matching your description out there. How about we start with something really classy? A BMW 316i maybe? Plenty out there, all priced around €11k and the 1.6-litre engine means reasonable tax and fuel economy even though it's a petrol engine.

Or you might need something a bit more spacious and economical. So we found a Citroen C5 Tourer estate with the 1.6-litre HDi diesel engine. It's a 2008 model so you'll be on the new CO₂-based tax system, it's massive inside and very comfy. Well built too.

Finally, you might fancy something a bit more compact and cheaper to run, and that budget opens up a world of Ford Focus saloons and estates with either the 1.6-litre petrol or 1.8 diesel engines. Simple, spacious, reliable and plentiful, you won't go wrong with that one.

WHat do you think?

Expert answer

Hi Michael,

Not really, no. The 1.9 TDI did get a minor reputation for having con-rod problems, but it was usually traced to another fault. Generally what happens is that a problem with the diesel particulate filter causes the engine management system to add too much fuel to the engine on start-up, which starts to thin out the oil, which then causes problems. There was another recurring issue with the air mass sensor, but that’s usually pretty easily remedied. Other than that, the old 1.9 TDI seems to be a pretty robust engine.