Expert answer

Hi Jim,

Well, the rule is never buy on mileage or even age, but only on condition and history. If the higher mileage car has been better cared for, and has a fully-stamped up service history, then it could well be just as good as the older but lower mileage one. Basically, take both for a thorough test drive and see which one 'feels younger.' If one has had a hard life, and the other an easy one, it should be pretty apparent which is the better purchase. 

Same goes for the 5 Series, but try not to get the less desirable manual. You may pay more for an auto now but it will be worth it come resale time.

Let us know how you get on

Expert answer

Hi Sandra,

Yes, the N47 diesel certainly had its share of troubles with that timing chain, and sadly it’s not as simple as getting it changed at a specific mileage. It’s an engine-out job to change, and they can go without warning.

Because of that, if nothing else, we’d steer you to the 520d with the older engine, but also that’s a genuinely fantastic car, especially with the M Sport body kit - and hugely entertaining to drive. Plus it’s more practical and comfortable than the 3 Series Coupe. Just make certain that it comes with a full service history.

Expert answer

Hi Mim,

By and large, yes. The 1.6 FSI engine was actually pretty peachy to drive, if rather underpowered. As with all underpowered cars, watch carefully for signs of abuse and hard-running by drivers frustrated with the lack of oomph. 

It seems to be a very solidly reliable car, but there are some reports in owner forums of problems with the cam belt tensioner repeatedly failing and needing to be replaced at almost every major service, while there are also some reports that the direct fuel injection system means that the inlet valves can become sticky with carbon deposits. That seems to be about it, though.

Expert answer

Hi John,

Yup, that seems like a good price, assuming the condition is good and all the service history is up to date. Make sure it's been in for a recall to have the steering system looked at and another one to reprogramme the engine control unit to stop it mistakenly kicking in to 'limp home' mode. 

A word of caution though; this car comes from an era when Mercedes-Benz was having a terrible time with build quality, and while the C-Class is generally well-made, we have heard reports of myriad problems, from small things like faulty door locks and handbrake linkages, to major items like engine injectors and ECUs. Buy carefully.

Let us know how you get on

Expert answer

Hi Liam,

OK, the value is a hard thing to put an absolute figure on as the 8 Series is now of an age where it's all about the condition and history of the car. If it's in good nick and there's a full set of BMW or independent BMW specialist stamps in the service book, then you should be looking at a value of around €6,000-7,000, maybe a touch less considering that this car has pretty high mileage.

Thankfully, that mileage is nothing to worry about, with one major caveat and that caveat is engine failure. Some 840ci models used engines with a cylinder bore lined in an alloy called Alusil, which is prone to wear and can cause the engine to go expensively pop. If your car has the other type of cylinder liner, Nikasil, then you should be fine, and by and large the 8 Series is an astonishingly robust car, with very few reported common faults.

Just make sure you check that everything electrical is working correctly, as the 8 Series was kind of on that cusp between the simpler pre-electronic age and the arrival of all the complex modern gadgets.

If you buy it, let us know how you get on and give us as flash of your cool pop-up headlamps!

Expert answer

Hi Ronnie,

It's a bit of a mixed bag, apparently. While the Rexton is a pretty simple beast, there are plenty of tales of electrical issues and minor glitches and we know of one owner who blew two Rexton engines in quick succession - after which he was advised to have it serviced every 10,000km! Other than that, keep a keen eye out for signs of abuse. Rextons are often seen as a cheap alternative to other 4x4s and so tend to be bought for hard work and heavy lifting. If it's been used off-road or on building sites a lot (a common fate for many Rextons) there could be some bodywork damage to deal with.

As for just being a car, they're not much cop to be honest. Noisy, slow and with spectacularly bad handling. You'd be much better off in a Toyota Land Cruiser, even if you have to go for an older model within your budget.

Hope that helps

Expert answer

Hi Niall,

Most modern cars tend to use a little oil and the level should be checked regularly rather than leaving it to the car to tell you. We wouldn't be massively worried about it at this stage, though perhaps mention it to the dealer when it is time for a service.

There's no harm in doing the service a little earlier than planned for added peace of mind.

Expert answer

Hi Richard,

By and large, yes, the Insignia's a reliable old thing, but there are a couple of checks to make. Ensure that the engine is pulling strongly in all the low gears, as the turbo can give trouble, especially with the exhaust gas recirculation (EGR) valve. If it's a specced up model with heated seats, check that the one on the driver's side works as they can be fragile. The lesser-used passenger one doesn't seem to give much trouble.

The 'Service Car Now' light seems to be a recurring problem and can come on a bit randomly - usually because the dealer forgets to reset the oil monitor at the last service. The boot seals, especially on the hatchback, can be iffy and allow water in especially when opening the boot when there's standing water on the car. It's a design flaw. There was also a recall to sort out an alarm system issue causing it to go off randomly (often at 2 in the morning...) so make sure that's been done.

Expert answer

Hi Frank,

The new-shape BMW 5 Series is a fabulous car, especially if it has the right equipment, such as a leather interior, etc. The 520d is nothing short of fantastic when new, though we've heard reports that this 2.0-litre turbodiesel engine can have expensive problems as it gets older - especially if oil maintenance is not adhered to strictly. If the one you're looking at has a detailed service history then there's less worry.

However, if you do very small mileage we'd question why you're going for a diesel car at all. The fuel economy might be tempting, but you should look around and see what petrol models you can get for your money too, as modern petrol engines are improving in terms of fuel economy and emissions - and they're generally cheaper to buy and maintain. They're also quieter and far better suited to low mileage use.

Let us know how you get on

Expert answer

Hi Evan,

Yes and no. No, in the sense that SEATs are generally very well made and the Arosa is a car with few repetitive problems. Yes in the sense that often a car with a smaller engine, and thus slower performance figures, is often ragged to within an inch of its life by previous owners just trying to keep up with the flow of traffic. If the Arosa you're looking at has spent most of its life in town, at low speeds, then it's probably fine (check the service history and condition, as always). If it's been used in the country, or on regular motorway trips, start checking for excessive wear and tear.