Expert answer

Hi Richard,

Lots of potential reasons for this. Very first thing I'd look at is tyre pressures. Are they all even and to spec? Are there any other issues with the tyres you can see? Uneven wearing, etc. If no problems with pressures I'd suggest getting the alignment checked. If it gets knocked out (relatively easy to do with a pothole or kerb) then there could be more friction causing heavier fuel consumption.

Come back to us when you've checked that.

Expert answer

Hi Jimmy,

We've done some ringing around for you based on extra information you provided us with (2010 Volvo S40 1.6 diesel). First of all, you can't do anything about different brands charging different amounts; that's a fact of life. We talked to several Volvo dealers around the country to compare pricing and they all quote similar amounts to the numbers you gave us. It seems expensive for the first service for sure, but at least you know it's standard across the network.

While we didn't ring every dealer in Ireland, we did get a quote from Bandon Motors (www.bandonmotors.com) that was much cheaper for the first service - though the same after that. Best bet is to ring all the Volvo dealers you are within easy driving distance of.

Of course, failing all that you could take the car to a non-Volvo garage, but I'm guessing you'd like the main dealer stamp in your service history.

Let us know how you get on.

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Hi Michael,

That sounds like the oil light switch to us. It monitors the oil pressure in the engine and switches on the oil light in the dashboard if it drops too low. It's quite common for them to develop leaks and they're relatively cheap to replace.

Hope that helps.

Expert answer

Hi Rob,

It's tempting to save money on tyres, but it's impossible to understate how important they are. As you've found out for yourself!

Personally I like the security of having winter tyres on at this time of year. I acknowledge that there are extra costs involved, plus some inconvenience in terms of changing them twice a year and storing the other tyres. However, I was converted last year when I experienced the difference first hand.

Saying all that, and despite two bad winters, the statistics still say that Ireland's climate is too mild to warrant having winter tyres on for a long period. If we do get heavy, sustained snow then snow socks will get most people out of a tricky situation at low speeds, but they have limitations.

So, assuming you'd rather not fork out on two sets of tyres in the next few months, what are your options? Well Bridgestone offers a good compromise called the A001 All Weather tyre. Sounds like it'd be perfect for you? I spoke to Bridgestone and there are limitations on the size they do - or have in stock - but take a look for a stockist though www.bridgestone.ie and take it from there.

Hope that helps

Expert answer

Hi Rory,

I don't have a strong opinion for or against the idea. I can see merit in the technology, but also major hurdles and potential issues. First, some good points:

• Potential to significantly reduce collisions caused by careless or distracted drivers
• Big gains in efficiency and fuel economy - on average
• Long-term could be used to transport people that cannot drive
• Could help ease congestion, especially on motorway networks
• Could eliminate drink-driving once and for all!

Some negatives:

• We all know that computer systems are far from infallible
• If something goes wrong, who is responsible? Legal minefield
• Would breed a whole generation that may never learn to drive for themselves
• I love driving and would hate for that choice to be taken away from us

We already have aspects of this technology in our cars right now, with things like Volvo's City Safe system (it can brake the car with full force if it detects a pedestrian in the car's path and the driver does not react) and Honda's Lane Keep Assist (where the car gently steers itself back on course if it thinks you're distracted) and it's likely they'll become more commonplace. Self-driving in really slow traffic may be next, though at all times a sober, responsible driver will have to be behind the wheel.

Fully autonomous cars are a long way off.

What are your thoughts?

Expert answer

Hi Noel,

Depending where you are in the world people refer to winter tyres as that or snow tyres. However, there are also more extreme tyres available specifically for driving on snow and ice that have metal studs in them.

Winter tyres that are suitable for Irish roads could be used all year around, though they do wear quicker in warmer weather. Likewise, in warmer weather they have less grip than a normal tyre. However, they come into their own in temperatures below +7 degrees centigrade (yes, that warm), as they don't harden. That means they're of use even if you're on a bone-dry road in low temperatures. On top of that they have 'sipes' cut into the rubber that massively increased grip on snow and ice.

Whether it's worth fitting them in Ireland is up for debate. Historically we only have a few days a year in which these tyres would be the best option, but the past two years have certainly increased the perception that we have cold, snowy winters. They are invaluable in such circumstances. Not only do they enhance traction to make it easier to climb hills, they also make it safer and easier to turn and stop.

A good value alternative to have in the boot that'll keep you going (at lower speeds) is snow socks.

Hope that helps.

Expert answer

Hi Mike,

The only reason you would specifically buy the efficient dynamics version of the BMW 520d is if you want to pay €104 in road tax, you want the best possible fuel economy and you don't mind changing gears yourself. I'd always prefer by luxury saloon car to come with an automatic transmission and in general, the used car market prefers if you do to. 

We could of course, give our opinions as to what is the best of these cars - but the fact is that they are all in and around the same price, they are all very good and they all offer different things. The BMW is regarded as the drivers car amongst the group although increasingly this is being matched by the excellent new Audi A6. The Mercedes is without doubt the most comfortable of these three cars so if have a very relaxed style of driving then the Mercedes might suit best. 

It does really come down to personal choice. The BMW is the best-seller and that probably won't change for some time. Also you have left out the excellent Jaguar XF, and now with a 2.2-litre diesel it is excellent value. That needs to be considered too. 

Expert answer

Hi Sean,

This is a well known issue with the Mazda RX-8. The level sensor in the overflow bottle starts to go. Check the coolant level when the car is stone cold and if it's down then top it up. Some people find that sorts out the light. If not, you could try to clean the sensor, but this might not do anything. I believe it's integral to the tank so you'd have to take it all out.

Because it's integral to the tank it'll be pricey to replace. Don't use a second-hand one, as they tend to go after a while regardless.

You can stop the light coming on by disconnecting the wiring to the sensor. Most people don't have a coolant level light anyway so just keep an eye on the level for yourself.

Hope that helps

Expert answer

Hi Adi,

Our usual point of reference is the Euro NCAP safety tests, but the G-Wagen has not been subjected to them. Our second source of data would be the US NHTSA tests, but again it looks like the Merc was not tested by that organisation.

The latest version of the G-Wagen comes with plenty of electronic driving aids to help with stability and traction, plus airbags, but it's not at the cutting edge of safety in terms of construction.

Sorry to not be able to give a more definitive answer.

Expert answer

The arguement for petrol is growing Brendan. While everyone is fixated on diesel the petrol engines are getting cleaner and will come back into fashion. When it comes to fuel economy the gap between petrol and diesel is getting closer and in a lot of cases there is little difference between the road tax.

The 1.4-litre petrol engine in the Passat is more than good enough. So if you want a Passat then you could go for it. There could and perhaps will be less value in the petrol model later on, but if you keep it long enough suddenly this won't become that much of an issue and since you go low mileage then you could keep it for 5 or more years.