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Hi Dolores,

The Fluence isn't one of our favourite cars, to be honest, as it's a bit dull to look at and drive, but in reliability terms it should be mostly OK. The 1.5 dCi diesel is pretty solid in that regard, and it's very economical. Just keep an eye on the electrics, as things like electric windows can give trouble. Other than that the only concern is resale value - it's an area where many previous Renaults have fallen down, so you need to be aware of that. If you're planning to trade it in for another Renault in a few years' time, you'll be OK, but switching to another brand could prove a problem when it comes to trade in.

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Hi Sean,

If the EGR valve is the problem then yes, replacing it will fix it. It's very difficult to successfully clean these things.

It might be worth bringing the car to another mechanic to get a second opinion before splashing out though.

Let us know how you get on.

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Hi Susan,

Wow, you're a glutton for punishment aren't you? You pretty much couldn't have picked two less reliable cars. The Discovery is best avoided. If you could afford to trade up to a third-generation model I'd say that's worth a go, as Land Rover was starting to get on top of its quality issues by then, but the old Series II is just bad news. Gearboxes go, electrics go and even the suspension can fail. I know what you mean about falling in love - it's happened to me too with old Land Rovers, but you're looking at a very high-maintenance partner there.

The Espace is a little better, but not by much. The diesel engines are very fragile - check for smoke, check for oil levels and if there are any signs of overheating, run don't walk away. Check anything with an electrical wire coming out the back of it too as it can all go wrong, although the electronic parking brake and electric windows are especially prone to wrongness. Also, keep an eye on the tyres. Espaces go through them like butter and 20,000km is about as much as you'll get out of a set.

If you really want a seven-seater that works properly, can I suggest either a Mitsubishi Pajero or Toyota Land Cruiser? Not as cool as the Discovery, but they won't let you down.

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Hi Andy,

I take it you mean from an insurance point of view? No, late thirties shouldn't be a major issue as long as you have a decent no claims bonus. As far as the car is concerned, I think you need to box a bit clever here. The kids are only going to get bigger (trust me, I know...) and you'll need something with a decent boot and big back seats for increasingly long legs. So, get yourself a Skoda Octavia RS. They've been around since 1999 in original form, but you need to be looking at the second-gen model, from 2006 onwards. Go for that and you get a car with excellent handling, a terrific engine (the diesel one is more economical, obviously, but the petrol 2.0 turbo is still reasonable in terms of running costs) and the boot is as big and practical as you could possibly need. They're also solidly reliable. It's the thinking man's hot hatch.

What do you think?

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Hi David,

OK, if you're determined to go diesel and you need a reliable 60mpg plus then the only safe option is to get yourself a Golf BlueMotion. Your Polo plus your budget should get you easily into one, but you have to remember that getting good fuel economy is actually all about your driving style. We recently managed to get better than 60mpg out of a 1.2 TSI petrol Skoda Rapid, and that was with four big blokes on board...

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Hi Noel,

Nothing too serious to worry about it. That 2.0-litre TDCi diesel engine does suffer occasionally from cutting out unexpectedly, but it's usually just a software fault and the ECU can be easily updated by a dealer. Other than that keep an eye out for issues with the keyless entry and ignition system (a rarely-seen option anyway) and keep an eye on the cabin - creaky trim is common and apparently the seat bolsters can collapse even on surprisingly low mileage cars.

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Hi Eamonn,

I'd say about €3,500. A little more if it's the D5 diesel version, but it's not the most beloved Volvo model and was unfashionable at the time because it was stuck with engines of 2.0-litre capacity and more.

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Hi Jay,

Well, that's pretty much all you'll ever see at a taxi rank in Berlin or Munich so draw your own conclusions. Just watch the 2002 - 2010 E-Class like a hawk. They were pretty shoddily built my Merc standards and developed a lot of electrical, braking and transmission problems.

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Hi Blaithin,

In my personal experience the most efficient car I've ever driven was the Volkswagen Golf BlueMotion - it easily averages better than 60mpg in everyday driving and I'm not the most economical of drivers. €20k should get you a nicely specced 2010 or 2011 model.

How does that sound?

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Hi Paul,

Yes! And I'm not just saying that because I own a 2009 one... MINIs are generally pretty well made and reliable, just watch the 1.6 diesel engine for problems with the turbo and the injectors, and check the cabin carefully for signs of abuse or wear and tear. Clubmans are prone to developing an annoying rattle in the little 'ClubDoor' behind the driver's door, but there doesn't seem to be an easy cure for it. If the car cuts out under hard acceleration, check the diesel filter; it can clog and cause fuel starvation.