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Hi Aaron,

I'd tread very carefully. Although the engines in the Megane II are pretty robust, any and all of its electrical and electronic systems are suspect to say the least, and the suspension is prone to failure too. Only buy if it has a seriously flawless service history and appears to be in perfect condition - and even then I'd be wary.

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Hi Dan,

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Hi Stephen,

It depends. If it's the old non-turbo 1.4 75hp engine, then there shouldn't be any problems. It's a solid old lump, and as long as it's been kept serviced, it should be fine. If it's the more recent 1.4 TSI turbo or turbo + supercharger, then be a little more cautious - they're more complicated engines and I'd insist on the car having a full and complete Volkswagen dealer service history before buying.

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Hi Philip,

Not all marques and not all models use AdBlue as yet. AdBlue is a urea solution that can be injected into he exhausts of diesel cars to neutralise a significant proportion of their emissions of nitrogen oxides (NOx) - very much in the news at the moment of course. The rule of thumb is generally only that larger, more powerful engines need an AdBlue treatment system as many smaller engines don't need the assistance. Each manufacturer, and indeed each individual engine, will have its recommended AdBlue top-up times, and it will be directly related both to mileage and how much acceleration the car has been doing. You can top up the AdBlue tank yourself - a 1.5-litre refill should cost around €11-12.

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Hi Gary,

Volkswagen has confirmed that, following investigations, the EA288 engines, designed for EU5 and EU6 compliance, are not affected by the scandal surrounding the EA186 engines. In other words, the current Volkswagen diesel engines are fine and have been given a clean bill of health. If you've any lingering doubts over a car that you own, go to http://www.campaigncheck.ie and enter your reg number.

Read our full news story on this subject here

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Hi Ede,

It depends on which engine your Fiesta is powered by. The 1.4- and 1.6-litre TDCi diesels have change intervals of 10 years or 125,000 miles (just over 201,000km), while the petrol engines (1.25-, 1.4- and 1.6-litre) have timing belts that need to be changed every eight years or 100,000 miles (160,000km).

We'd always advise readers to have the timing belt changed sooner rather than later, especially if the service history of the car is unknown.

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Hi James,

The new Volvo S90 saloon, which will share its engines, chassis and, yes, that gorgeous interior, with the XC90, will go on sale in mid 2016 and will make a full public debut at the Geneva Motor Show next March. There'll be a massive V90 estate too we're told.

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Hi F D,

There does seem to be an issue with the turbo- and supercharged engines involving the timing chain and it seems to be because Volkswagen tried to stretch the service intervals too far. Now, your A3 may not have that particular engine, depending on the year and the engine power. The lower power 122hp version of the 1.4 TSI didn't have a supercharger, just a turbo so is simpler and doesn't seem to suffer the same issues. The more recent 150hp version also does without the supercharger, so the best thing to do is not panic - if you're concerned about the car, take it to your dealer, have it inspected and maybe insist on a more frequent oil change.

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Hi Thomas,

Yes, in fact they're much better because they're smoother (thanks to direct fuel injection instead of the old Pump Düse system) and have much more sophisticated electronics to monitor their health. They don't seem to suffer from the old air mass sensor issues that plagued the 1.9 either. It's also a much more economical engine - figure on getting high-fifties mpg, rather than the high-forties of the old engine.

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Hi F D,

The Audi Q2 won't actually be called the Q2, it'll be called the Q1. Why? Because Fiat owns the rights to the Q2 badge and won't let Audi play with its ball. So the Q1 will sit beneath the existing Q3, and will be based on the same MQB chassis system that currently underpins almost everything Volkswagen, from Golf to A3 to Passat to Superb. The next Q3 will get a little bigger too, to make some space for the Q1. Expect the Q1 to skew a little more towards an estate, crossover-y body style, leaving the Q3 to be taller and blockier and more SUV-ish.

We have no official word on engines yet but as it's MQB-based expect 1.4 turbo petrol and 1.6- and 2.0-litre TDI diesel, with an SQ1 sports variant using either a tweaked diesel or 230hp petrol turbo. It'll go on sale in 2016 and we'd expect to see a full production model at the Frankfurt Motor Show in September.