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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?

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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.

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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. 

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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

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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. 

Expert answer

Hi Paddy,

This really sounds like a clutch failure. Many cars have hydraulic clutch mechanisms, which is why you may still get the feeling that the clutch is ok. However, it could be that a driveshaft or a part of the gearbox has failed. It's highly likely it's 'just' the clutch though.

Bring the car along to a mechanic to get it checked out.

Expert answer

Hi Brendan,

Having just come out of a Volkswagen Golf long-term test car I feel like I can speak with some authority on the car. For a start, it really depends on where you are driving and how far, when it comes to your engine choice.

The 1.6-litre TDi diesel is really good, but it probably isn't worth the extra cost unless you commute is quite long. Otherwise the 1.2 TSi is fine and while it isn't a rocket, it is perky enough. In terms of the the car being big enough, well yes it is. The Golf is fine for one baby and the boot is big enough to take the truly obnoxious buggy I put into it. 

With your budget of €20,000, you would really have your choice of petrol or diesel models so it is really down to what you prefer. I really like this one. And although it is over your budget you would probably come in under as a cash buyer. 

Expert answer

Hi Paul,

I really would find it hard to look past the new BMW 520d and you could perhaps get into one for your budget, but you might have to wait until January. A low mileage one is just outside your budget.

BMW 520d 

Now having said that, if you made a firm offer of €35,000 you might be successful, but the new car is so much better than the old one then you would need to get into it. The Audi A4 and Mazda6 are very different cars. The Mazda6 is very nice and you could get into a new one with your budget with a high spec. The Audi A4 is also good value now, but with a new model around the corner it might be best to hold off.

My advice Paul would be to hold on a few months if you can. I'd wait until January and see what happens to prices of 520d and if we have a new Audi A4 by then we will know whether that is worth looking at. For now anyway, hold on!

I hope this helps!

Expert answer

Hi Jason,

We've come across these symptoms before and they usually mean a camshaft or crankshaft sensor is faulty. The issue is that they work fine when cold, but when they warm up the fault creeps in. Bring your car to a garage when warm and get them to put it on a diagnostics machine to confirm.

Hope that helps.