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Hi Tom,

How about a Fiat Multipla? OK, not everyone's idea of a good looking car, but it's got an amazing interior, bags of space, is terrific to drive and I found one for €4,500. Yes, I know... OK, on with the sensible stuff though.

There are plenty of Opel Zafiras around for that kind of money, but you will have to search hard to find a diesel one. They are out there though. Plenty of Peugeot 307 SW estates (which came with a seven-seat option) too, but tread carefully and make sure there are no electrical gremlins to deal with. Ditto Renault Scenics. Actually, the more ruggedly reliable Kangoo (or a Citroen Berlingo for that matter) might be a better option.

The most sensible suggestion would be a Toyota Corolla Verso, but they're very, very hard to find with a diesel engine at that price level. Might be worth biting the bullet and going for petrol to get the best.

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Hi Gerry,

You've picked three difficult cars to choose between. Obviously, both the Hyundai and Kia are essentially the same car beneath the skin, and both come with temptingly low prices and long, long warranties. The SEAT's three-year warranty looks a bit brief in comparison, but then you are buying into a car with excellent reliability and high quality, so there's that.

You've also got an odd combination of relatively high mileage, but in an urban location, which suggests that you won't be working up enough speed to generate exhaust heat to keep a diesel particulate filter (DPF) clean. With all that in mind, I think your best best might be a Leon 1.2 TSI petrol. It's a cracking engine, nearly as good as a diesel on fuel economy, but with no nasty surprises waiting in the exhaust. Both the Hyundai and Kia are excellent cars, but both are best experienced as diesels.

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Hi Austin,

We're going to assume it's on the new CO₂-based taxation. The 2.0 diesel S-Max emitted 169g/km, which means it's in Band D for tax, costing €570 per annum.

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Hi John,

OK, there's a balancing act to be done here. There's no doubt that the CO₂-driven diesel stampede since 2008 has driven up the values of second hand diesel cars and driven down the values of their petrol equivalents. However, that is starting to change, and cannier buyers (helped in some part by investigations and comparisons by the CompleteCar.ie team - blowing our own trumpet etc. etc.) have shown that the overall cost of buying and running a petrol engined car can actually be lower than that of a diesel, especially for those drivers on relatively low mileage like yourself.

In that sense, I'd be well in favour of getting the petrol one, but there is a caveat to that - the A4 is very much a business market car, and therefore most of its prospective buyers, new and used, will be expecting to see a TDI badge on the boot. If you're buying on a lease or a PCP with a guaranteed future value, then that's not such an issue, but the answer is yes, you could well lose out a little on depreciation over a few years. Probably not a lot, but it's a moving target at the best of times.

Can I suggest this? Instead of an A4, have a look at the A3 Saloon. It's admittedly smaller, but it is also prettier, better to drive and good enough to win Family Car of the Year from the Association of Professional Motoring Press (APMP). It can also be had with the excellent little 150hp 1.4-litre turbo petrol engine and should be somewhat less sensitive to the diesel/petrol tug of war when it comes to second hand values.

Let us know which way you go anyway.

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Hi Eoin,

Yes, it's a fine purchase as long as you go in with your wits about you and make sure that it's got a full service history. Any expensive German car without one is effectively worthless... That generation 3 Series was pretty robustly built and was less technically complex than later versions, so there's less to go wrong.

If it's the 2.5 straight-six petrol you're looking at, then it's a reliable unit, and well-proven, but watch carefully for any signs of water leaks or head gasket trouble. If it's had cooling or head trouble in the past, it's very likely to happen again and you could be looking at an engine swap. If it's the 2.5 diesel you're looking at, check for any white smoke from the exhaust or lumpy power delivery, which could indicate turbo problems.

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Hi Maria,

I presume you're talking about a first generation Mazda3, seeing as most of the second-gen models came with diesel power. The official economy for a 2005 model year Mazda3 1.6 petrol is 39mpg with CO₂ emissions of 172g/km.

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Hi Gary,

There is no adjustment to be made. We spoke to Honda Ireland about this and it's suspected that fuel contamination and/or a blocked fuel filter is to blame.

First thing to do is change the fuel filter, clear the code and try it again. Honda says it would normally look at what is in the old fuel filter before running the car again, as it may reveal a need to drain and clean the fuel tank.

Let us know how you get on

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Hi Kevin,

Generally speaking it's the E-Class that followed, the 2002 onwards model, that gave all the trouble, and the generation you're looking at doesn't give quite so much bother. As far as we can gather, the E200 K should be a reasonably rugged engine, but the crucial thing to note is to make sure that it has been serviced on time every time, by someone who knows what they're doing, and that you continue to do so when you own it. If there's no service history, or a patchy one, walk away.

Also watch for rust bubbling up under the front wings and make sure that the front suspension bushes were replaced at 60,000 miles. In that generation of car, I wouldn't necessarily expect the diesel version to be any more or less reliable.

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Hi Michael,

The Qashqai is a cracking car, but the problem here is that the new, second generation Qashqai, is so much better, it makes the old one seem just a tad disappointing. On that basis, I'd go for the cee'd - it's handsome, nice to drive, well made, has a massive boot and still has four years of its warranty left to run.

Let us know what you decide either way

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Hi Breda,

It takes 3.8 litres of oil if a new oil filter has been fitted. Best to top up in smaller amounts and check it as you go to prevent overfilling, as that can cause a lot of problems.