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Hi Maria,

Both are very good. We’d rate the Hyundai for its reliability, neat styling and roomy cabin, and the Astra for its peachy chassis and steering. Worth considering the turbocharged petrol versions of both, too, as they make more sense overall than diesel, unless you’re doing mega-miles every week.

Read our 2013 Hyundai i30 review

Read our Opel Astra reviews

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Hi Gavin,

I'm afraid the registration you gave us came back as a Hyundai on Cartell.ie, so we assume there's a typo there. However, looking at the 2008 Focus:

1.4/1.6 petrol: timing belt

1.6/2.0 TDCi diesel: timing belt, with small timing chain at back of engine joining the camshafts

1.8 TDCi diesel: timing belt, with separate belt or chain for high-pressure pump drive

1.8/2.0 petrol: timing chain

Hopefully that covers your car, but come back to us if not, with more details.

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Hi Tomas,

Well, the NOx tax isn’s about the size of the engine, it’s about the NOx emissions, which are not specifically related to the size. It could be worth getting on to the Japanese Ministry of Land, Infrastructure, Transport and Tourism, who may be able to provide you with a specific NOx figure for the car you’re talking about, but otherwise, just be thankful it’s not a diesel — those are subject to a maximum €4,850 extra in NOx tax if you can’t provide an accurate figure. 

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Hi Mick,

You should be able to get a figure from the Japanese Ministry of Land, Infrastructure, Transport and Tourism. According to Revenue: "If a NOx figure cannot be provided for a vehicle then a flat charge will apply.” For a petrol-engined car that’s a maximum of €600, so it’s not the worst news in the world (a diesel-engined car would be charged as much as €4,850).

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Hi John,

There's a lot less going on in the exhaust aftertreatment of a modern petrol engine than the equivalent diesel so I suspect the diesel needs the warm-up more. It may also be due to the extra strain on the starter and battery due to the high compression of the diesel engine. When the oil is cold, the friction may be higher, causing a higher strain again. 

Either way, it's nothing to worry about.

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Hi Lee,

It's only the 1.8 TDCi diesel engine from Ford that used that wet belt set-up, none of the others. The 1.8-litre engine was never offered in the Kuga.

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Hi Keith,

You've not told us the model year, but if it's a 2010 car or older and it has never had its timing belt changed then it's likely to be a reminder to have it done. The belt in, for example, a 2010 Kuga 2.0 TDCi diesel, must be changed at least every 200,000 kilometres or 10 years, whichever comes first, so, even though yours has only done 106,000km, if it's 10 years or more old, the belt must be changed.

If you'v already had the belt changed, you'll need to bring the car to a garage with a good diagnostic computer so they can reset the computer for you.

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Hi Ed,

OK, this one takes a bit of deciphering. I’m guessing that you mean you own two Mercedes-Benz models, both using the 2.1-litre diesel four-cylinder engine. I’m also assuming that you’re talking about the cost of motor tax, although the €290 figure is a little odd — did you mis-type when you meant either €280 (for Band B2) or €390 (for Band C)?

The discrepancy could be down to a number of factors. You don’t, for example, state which models you’re talking about — E-Class? C-Class? Coupe? Convertible? Estate? Do both cars have automatic transmissions? Are they both on the same size wheels? Were they both manufactured in the same year? There’s a huge variation in vehicle emissions and, if you’re talking about the gap between Band C and Band D, it takes only a single g/km of CO₂ to tip from one to the other. 

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Hi Julie,

In many ways, diesel would be the safe bet, but with your 90km per day driving pattern, I’d suggest that you’re potentially an ideal candidate for switching to electric. Certainly, a current Kia e-Niro or Hyundai Kona Electric would do your five-day daily commute on almost one charge (although realistically you’d probably top it up much more regularly than that). As long as you have a driveway where you can install a home charging point (and a charging point at work would be helpful too), then I’d say it’s well worth looking at electric. The savings on fuel alone will help to balance out the cost of purchase. 

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Hi Gino,

That Ford 1.6 TDCi diesel engine is one of the most common engines around, as it has also been used by Mazda, Volvo, Peugeot, Citroen and MINI. It has one major vulnerable spot and that is that sooty, gummy deposits can build up in areas that are supposed to be kept cool and lubricated by oil. If the deposits build up enough, they can block the oil passage and cause component failure — most commonly of the turbocharger. The best way to prevent that happening is with regular servicing (at least once a year depending on mileage) and making sure that you always use a high-quality grade of synthetic oil for the engine.

The 1.6 petrol engine, the 100hp version, is a much simpler unit and it’s pretty reliable, mostly because it’s a much older design. It won’t be as economical nor as punchy in its performance as the diesel, but if it’s reliability you’re looking for, it might be the better option.