Expert answer

Hi Ollie,

Generally speaking, you should be OK, as that 30-min run each day should be enough to keep a DPF hot enough to clean it out, but that’s if and only if that 30 mins is all run at high-ish speeds, say above 80km/h most of the time and in a lower gear. If you’re spending a lot of time in stop-start traffic, I think a petrol option might still be the better one. Mazda’s 2.0-litre petrol engine can be a bit thirsty, but the 1.4 TSI option in the Passat and A4 is a very frugal engine, and still has peppy performance.

Expert answer

Hi James,

As discussed via email:

That generation Audi A6 is in general a reliable car, but not fault-free. Some owners have had no problems, while others have been plagued. The Multitronic transmission is not renowned for being the most trouble-free, though units made pre-2006 have the most problems. Also, the gearbox's fluid should be changed at 55,000 and 115,000 kilometres (or 35,000 and 75,000 miles) so the car you're looking at should have had two changes by now. Check that it has and then look in detail at how the gearbox works. Does the 'PRNDS' indicator on the dash flash? Is there hesitation? Is it easy to get reverse?

No matter what turbodiesel car you look at you'll hear of turbo problems from some owners. Most of the time it's likely to be due to poor oil maintenance. So check the car's service history in terms of oil changes and that the oil level itself is right. They do use a bit of oil.

While you're checking out the car in detail, make sure the air conditioning can produce freezing air in just a few minutes, as these have been known to fail.

I'm probably making this sound worse than it is! I'd buy an A6 for myself - it's a good car - you just need to know what you're looking for and not get caught out by one of the few badly maintained examples out there.

Let us know how you get on.

Expert answer

Hi Daniel,

As that car is pre-2008 it is taxed according to its engine size. Following the Budget announcement (December 5, 2012), the cost of taxing that car for a year has risen from €962 to €1,034.

Hope that helps,

Expert answer

Hi Joe,

In general this is a sound purchase, though there are a few things to look out for as ever. We'd advise readers to get as full a service history as possible, even on a relatively old car such as this. On the diesel models check for smooth running and have a look at the condition of the oil. Walk away if it's filthy or there's blue smoke in the exhaust. Black smoke under acceleration shouldn't be an issue though.

The 1.8-litre turbocharged petrol models are known to have issues with their coil packs, while many have air conditioning problems. Just make sure all switches work as you'd expect and check that the air conditioning gets cold within a few minutes. Minor electrical gremlins seem to be this car's biggest problem, but don't let that put you off - just thoroughly check the car you're considering buying.

As ever, we'd advise you to bring along a mechanic to inspect the car before you commit any money.

Let us know how you get on.

Expert answer

Hi Andrew,

You're in an enviable position. I'm going to go on the assumption that four-wheel drive is a must-have (though a rear-wheel drive car on winter tyres is as good as a 4x4 without in terms of stopping and changing direction as well as traction...) and given your comment on fuel we'll say it has to be diesel too. Don't worry, there's still fun to be had.

The 3.0 TDI V6 engine found in certain Audi A6s and A8s is a gem and partnered with quattro four-wheel drive seems made for you. The equivalent rear-wheel drive BMWs are a little more engaging, and the 330d/530d's engine is also fantastic, though we suspect you want four-wheel drive. Try a 535d out for size and you might change your mind and invest in winter tyres instead!

As much as we admire the X5 and Touareg, and they're good value on the used market at the minute, we can't help but feel they'll be just as difficult to sell on in a few years.

Another excellent alternative to the (quite common) Audi A6 is the allroad quattro version, based on the A6 Avant. Seems to tick all the boxes.

Let us know if we're on the right track here.

Expert answer

Hi Fergus,

You've not told us the type of engine in the car, but for your information only the 1.6-litre petrol and 1.9-litre TDI diesel units have timing belts. The change interval is 75,000 miles (just over 120,000km) so if the car you're looking at has one of those engines then it should have had a timing belt change by now.

Other than that insist on a full service history and regardless of what the dealer says it's worth getting a car history check on Cartell.ie, as it covers UK and Northern Ireland cars in full.

Hope that's of help.

Expert answer

Hi Patrick,

Clutch wear will depend on the driver and also where the car is being used mostly. Without knowing much about either of those we can't make a full judgement, but our initial reaction is that it seems too soon for a car such as that to need a new clutch.

We'll be in touch with you via email, and Audi Ireland, to come to a more concrete conclusion.

Expert answer

Hi Jonny,

In general this is a reliable engine and car, though there are a couple of known issues. These include the fuel sender in the tank and the variable geometry turbocharger actuator. The former you'll only spot if you know the fuel readout is wrong. The latter will be indicated by loss of power and the car going into limp home mode. This can often be cancelled by restarting the car so take as long a test drive as you can. No harm asking whether the seller has had either issue either and it's vital to have a full service history on this car.

Let us know how you get on.

Expert answer

Hi there,

The original Audi guarantee will be long gone, unless the previous owner had paid to have it extended, and it would have to have been serviced at an Audi main dealer to still be under cover. The fact that you’re buying it from a Nissan dealer suggests that’s not the case. Nissan does offer a ‘Gold Standard’ used car programme, which comes with a one-year or 15,000km warranty on used sales, and which will have carried out a multi-point check on the car. You’d always be advised to get your own history and finance check done, but if it’s a main Nissan dealer, they’ll likely have already done that.

Expert answer

Hi James,

I believe you're referring to the issue with sudden loss of oil pressure due at times to the gear on the balancer shaft failing. Our research leads us to conclude that this issue was sorted before the Tiguan went into production, but to make sure, we can send your car's details to Volkswagen to check the records.

So, send us a message via the site with your registration plate for a start. We won't publish it.