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Hi Robert,

The weak areas on an X-Type are the suspension and transmission. Keep an ear out for gearbox whines, knocking suspension and rattling steering columns. Wheel hubs were known to fail on earlier models but a 2010 version should be fine. Worth noting that the X-Type seems to have higher repair and maintenance costs than an equivalent BMW or Audi - rather odd for a car that shares so much with a Ford Mondeo. 

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Hi Dermot,

If you mean actually physically swapping out the engine and plumbing in a diesel then I wouldn't recommend it. Diesel engines are much heavier than their petrol counterparts and most car makers tweak the suspension, brakes and steering to allow for that fact. Putting a diesel lump in where a petrol one was could upset that delicate balance. Also, it's an enormous amount of expense and hassle to do so, when you could just trade in for a similar model with a factory-fit diesel.

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Hi Liam,

Pros are that Volvos tend to be very well made and are generally a reliable car and that 1.8-litre engine is an old Ford unit that's well proven and dependable. 

Cons are that for a car competing with the likes of the BMW 3 Series and Audi A4, the S40 is very small and a bit cramped and the emissions of that 1.8 will give you some fairly juicy tax bills.

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Hi Ciara,

At that budget, I'd suggest going for either a BMW 320d Touring (very sleek, decent boot space and terrific to drive) or a Volvo V70 (bigger, comfier, more space but not as swish to drive or look at). Both are solidly built and reliable and there are plenty of them out there, so be choosy about spec, colour and condition.

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Hi Ruadhan,

That, I'm afraid, is a question with too many variable answers. Second-hand vehicle values are like stock market values - they go up and down and often rather unpredictably. There are a few rules of thumb, though...

1. It's got to be diesel. Yes, we (and others) have tried to educate the motoring populace that diesel power doesn't automatically mean better economy or lower running costs, but right now the market is diesel-crazy and if it doesn't sip from the black pump, it's not going to hold on to its value.

2. The lowest depreciating cars are, obviously, the most popular models. So the likes of the Ford Focus, Volkswagen Golf, Nissan Qashqai, Hyundai Santa Fe, BMW 3 Series, Audi A4 and so on will always hold on to their value the best. Check the list of the top-ten best-selling cars on the market - these are your depreciation heroes.

3. What about depreciation villains? Anything that the market doesn't trust, really. Estates tend to fare especially poorly, anything with a French badge is suspect and if it's Italian, forget it. You'll lose your shirt on any of these.

4. Spec is king. You can have the most in-demand car going but if it's painted bright yellow and has green seats, you're never going to shift it. So, to keep depreciation at bay, stick with dark metallics and subtle interior tones. Pale cabin colours tend to fare less well when it comes to wear and tear, so the market prefers blacks and greys on the inside too. If it's an executive car, it has to have an automatic gearbox. Anything with factory-fit air conditioning and Bluetooth telephony is looking good, leather is always helpful but other expensive toys don't always help a car hang on to its value.

Hope that's all of interest

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Hi Tom,

If the stop-start system is not working ever then it's probably worth a trip to your Audi dealer to have it looked at, but bear in mind that there are plenty of conditions in which it will not operate and it may not be immediately obvious why. Here's Audi's official stance on it:

"The system is automatically activated when the ignition is switched on. If the driver doesn't want to use it, it can simply be switched off at the touch of a button.

"This is how it works: brake the car down to a standstill, shift into neutral and release the clutch. The system now switches off the engine and signals this via an indicator lamp. Depress the clutch before continuing the journey - the engine now starts automatically and the indicator lamp goes out again.

The start-stop function only works when...

• the driver's door and the bonnet are closed
• the driver is wearing a seat belt
• the vehicle has been driven at faster than 4km/h before stopping
• the vehicle is not pulling a trailer

In some cases the engine will not be switched off, for instance when...

• the engine temperature is still too low
• the difference between the interior temperature and the temperature selected via the air conditioning system is still too great
• the outside temperature is very high or very low
• the windscreen is being de-iced
• the optional parking aid or the optional park assist is activated
• the battery charge is too low
• the steering wheel is at a sharp angle or is being turned
• reverse gear is engaged
• the road is steep

The engine is started automatically by the system when...

• the vehicle rolls forward
• the windscreen is being de-iced
• there is a large difference between the interior temperature and the temperature selected via the air conditioning system
• the brake pedal has been depressed several times in succession
• the battery charge is too low

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Hi David,

I'd suggest flogging both cars and getting yourself into a newer Audi A3. They're comfy, sweet to drive, reliable and easy to sell on again eventually. Hard to go wrong with it, really. Lots to choose from so be fussy and make sure yours has a full service history and reasonably low mileage.

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Hi Brendan,

Good choices, all of those, if you're looking for a more affordable 3 Series alternative. The new-shape Mazda3 (the one that's only just been launched) seem to be especially excellent, and with Mazda's reliability you won't be spending too much on repairs or maintenance down the line. The Golf is always a safe bet too, although if you're used to the saloon shape it may be worth having a look at the little-seen Jetta - an underrated gem, that car. Or, alternatively, you could try the Audi A3 Saloon, which I reckon is the best compact sports saloon around at the moment.

See how you get on and let us know which one you go for.

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Hi Colm,

It doesn’t really stand for anything, it’s just a trim level. In the dim and distant past, SE stood for Special Equipment, but from an Audi perspective it generally means the most affordable model in the range.

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Hi Janice,

Yes, but perhaps not the most economical in the class. Going on personal experience, a Mercedes-Benz E 200 or E 250 CDI will average in the high forties mpg whereas a BMW 520d or an Audi A6 2.0 TDI should easily get over the 50mpg barrier in everyday driving.