Expert answer

Hi Justin,

Two best choices here would be a Mazda6 2.0 TD from around 2003 or a Ford Mondeo Zetec diesel of similar vintage. As long as they're in decent nick, reliability shouldn't be a problem (the Mazda will do better than the Ford but not perhaps by the margin you might be expecting) and both are safe and spacious.

What do you think?

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Hi Evelyn,

Actually, the Hyundai ix20 might be just the thing you're looking for. It's smaller and cheaper to run than a Golf, and that 1.4 diesel engine is very economical, and will actually prove more powerful to drive than the Golf. Others worth considering are the Citroen C3 Picasso or Ford B-Max, both of which can be had with either petrol or diesel power. Try a 1.0-litre turbo petrol B-Max actually - great fun to drive and you won't believe the power and performance Ford can get from its new downsized 1.0-litre engine.

Let us know how you get on

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Hi Andy,

Well, they're two quite different cars. The Avensis is significantly bigger than the Focus, so if it's space you're looking for, that's the one to go for. To be honest, I think it's the Avensis to go for anyway. Assuming the prices are similar and condition and history are good, then Toyota's build quality and reliability is just that little bit ahead of Ford's, so its long-term longevity should be better.

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Hi Geo,

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Hi Keith,

It really just depends on two things; her driving style and habits and what kind of condition the car is in. If it's in good nick, her average mileage is quite low and she's able to maximise the economy from that engine, you may just be better off spending a little bit of money getting the car thoroughly serviced and spruced up and sticking with it. If though her mileage is creeping up or you feel that the car is starting to age then it could well be worth trading in for a newer Passat. The current model is essentially the same car, but updated and re-skinned and the 1.6 TDI diesel gives it terrific economy.

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Hi Dermot,

If you mean actually physically swapping out the engine and plumbing in a diesel then I wouldn't recommend it. Diesel engines are much heavier than their petrol counterparts and most car makers tweak the suspension, brakes and steering to allow for that fact. Putting a diesel lump in where a petrol one was could upset that delicate balance. Also, it's an enormous amount of expense and hassle to do so, when you could just trade in for a similar model with a factory-fit diesel.

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Hi Dan,

Hmmm. Generally for your mileage I would recommend a petrol car, but the bad news is that in your size bracket, petrol engines are a little thin on the ground. You could go for either a straight replacement for your Corolla by getting a Toyota Auris 1.4 D-4D, which is a very fine car, or you could, as you suggest, branch out and snap up a Hyundai i30 1.6 diesel - again a very fine car and with that five-year warranty, a very tempting buy. 

But, with your mileage profile, I would suggest taking a good long look at petrol alternatives. The Ford Focus 1.0 EcoBoost is a terrific car with a great engine and well worth a look. That said it's a little tight in the back seats for two teenagers so I'd say the best all round bet is a Skoda Octavia 1.2 TSI. It's more affordable than the diesel version, damn near as economical and has a big boot and lots of space in the back seats for those teenager-filled weekend runs. Great quality and reliability too.

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Hi Michael,

It kinda depends on the spec of the cars in question. If, for instance, it's a 2.0 160hp Insignia versus a 110hp 316d, then go for the Opel. If it's a 320d, then go for the Beemer.

Come back to us in the comments if you'd like more help.

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Hi Jean,

Tricky to say, I'm afraid, as the trade-in value offered by a dealer has as much to do with their business model and circumstances as it does with any intrinsic value in the car. It also of course depends on the car you're trading it in for. If it's something that's sticking to their forecourt, they'll be more keen to offer you a good deal to get shot of it. Values for a 5 Series like yours seem to vary from around €27,000 at the high end to low-twenties for higher-mileage models. You can knock off around €1,500 - €2,000 from that for the dealer to build in a margin and defray any costs of preparing the car for sale, so your trade-in should range from around €20,000 to €25,000, but that's a best guess and nothing more.

Try and have a ring around (or better yet, a drive around if you have the time) to various dealers and try and get them to give you a rough idea of what they'd give you for the car.

Do let us know how you get on,

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Hi John,

Yup, a small diesel sounds like it should be ideal for you. Depending on what kind or size of car you need I'd recommend either a MINI Cooper D 1.6 (small and sporty), Opel Astra 1.3 CDTi (slower, but more spacious), Toyota Auris 1.4 D-4D (similar to Opel but probably more reliable) or that old favourite the Volkswagen Golf 1.6 TDI BlueMotion (ultra economical). Or, if you need more space how about a Skoda Octavia Combi estate 1.6 TDI or a Citroen C4 Picasso 1.6 HDi?

Help us with your needs and we'll narrow that down a little!