Used BMW 4 Series Convertible 2014-2020 review

Yes, it's been around for some time, but if you want a suave four-seat convertible from one of Germany's sportiest brands this could be just the used car for you.

The BMW 4 Series Convertible was the predictable 2013 follow-up to the coupé version of the same name. Both were launched to replace the 3 Series Coupé and Convertible, the idea behind the name change being to make BMW’s ever-expanding line-up less confusing for customers to understand.

BMW also took the opportunity to give the 4 Series a sleeker look, and this is especially the case in the convertible, with its folding metal hard-top. That roof looks suitably theatrical as it opens and closes, as well as providing more security than the soft-tops of BMW’s rivals, the Audi A5 Cabriolet and Mercedes-Benz C-Class Cabriolet.

The drawbacks of such a roof are that it weighs a lot more than its canvas equivalent, takes up more space in the boot and can’t be opened or closed on the move above 8mph. So if any of those is a deal-breaker, a used 4 Series is probably not for you.

The heavy roof also takes the edge off the excellent handling you get with a 4 Series Coupé, with the convertible noticeably less agile when it comes to changing direction. It’s still a cut above rivals, however, and remains the keen driver’s choice as far as cars of this type are concerned.

The extra weight also means the engines receive a harder time, so if your idea of a BMW convertible means having something powerful it’s worth opting for one of the six-cylinder units such as the 435i or 430d if budget allows, rather than the four-cylinder 420i, 428i, 420d or 425d. You can also have a high-performance M4 version, with 444bhp. We’d also recommend going for the smooth-shifting automatic gearbox rather than the six-speed manual, which can be notchy to use.

On the road, BMW’s six-cylinder petrol engines have a reputation for being smooth-running and, sure enough, life is suitably hushed once you’ve got the 430i and 440i up to speed, even when the roof is down. The 420d is quite noisy, especially when revved hard, although this is rarely necessary because it pulls strongly from low revs. And since you're unlikely to be bothered by any of the engines when the roof is up, we'd be tempted to go for the 420d for its lower running costs.

Wind noise is kept to a minimum, and while there's some buffeting with the roof down, it's only in the back that it makes life uncomfortable. Road noise is more of an issue.

The 4 Series Convertible’s steering is accurate, but the car’s weight means it’s not entirely happy with sudden, rapid changes of direction. It is comfortable, though; even in stiffer M Sport trim, the suspension does a decent job of dealing with road imperfections.

Ride comfort is pretty good and front-seat occupants are well protected from the wind, even at motorway speeds. There is, however, rather a lot of road noise whether the roof is up or down and anybody who sits in the small rear seats will be both cramped and battered by the wind. Worse still, if you want to use the wind deflector, it means giving up the rear seats altogether due to the way it clips into place. It makes the C-Class Cabriolet look thoroughly practical by comparison.

A facelift in 2016 resulted in the 428i being replaced by the 430i, and the 435i being replaced by the 440i, as well as improved equipment including LED headlights and revised suspension settings on all models. At the same time, a TFT digital dial display was made available as an option.

To find a used BMW 4 Series Convertible in our used car classifieds, click here.

The market for BMW 4 Series Convertibles starts at about £12,000 to £13,000, which will buy you a car from 2014 or 2015 with close to 100,000 miles on the clock. Spend between £14,000 and £16,000 on good 2015 and 2016 models, or between £17,000 and £20,000 on clean post-facelift 2017 cars. You'll need around £20,000 to £25,000 for a 2018 car, and around £25,000 for a decent 2019 model.

Whatever engine you decide on, it’ll probably come in M Sport specification, which accounted for the vast majority of 4 Series Convertible sales. The other trim levels are SE, Modern, Sport and Luxury, although all but Sport were dropped over time.

For the lowest running costs, you’ll need a 420d, which returns as much as 60mpg in the official NEDC economy tests. In real-world driving, owners manage about 45mpg, whether the car is fitted with a manual or automatic gearbox, and benefit from paying as little as £115 per year in road tax.

A 430d is also reasonably affordable to tax, at £135-£150 per year, while a 435i is £240-£280 per year. In terms of fuel economy, these cars will manage about 40mpg and 30mpg respectively.

Later models were rated under the newer and more realistic WLTP tests, and average 35.3mpg in the 420i, 33.2mpg in the 440i, 46.3mpg in the 420d, 40.9mpg in the 430d and just 28mpg in the high-performance M4 version.

Cars registered after the tax changes of April 2017 came into force will set you back a flat-rate fee, currently £150 a year, and those that cost over £40,000 new will also incur a luxury car tax, currently £325 a year.

When it comes to servicing, it’s worth looking for an example that was ordered with BMW’s five-year inclusive servicing package, which is transferable between owners. There are no fixed service intervals as such (the onboard computer will tell you when it’s required) but, as a guide, you’ll need to factor in a visit to the workshop once a year to keep things running smoothly.

As mentioned earlier, the fact that the BMW 4 Series Convertible is so much heavier than the coupé means it is very tempting to stretch to a six-cylinder model if budget allows. However, for most it’ll be hard to ignore the lower purchase price and running costs of the 420d, even if it does mean settling for a car that is ultimately slower and noisier.

As far as trim levels go, you might save a bit of money by opting for an SE or Sport over an M Sport, but as they are relatively scarce and won’t hold onto their value as well, it’s probably a false economy.

In terms of equipment, all models come with everything you'd really need, including dual-zone climate control, BMW’s iDrive infotainment system, Bluetooth, parking sensors and leather seats. To this, M Sport adds sportier body styling, larger alloys and a firmer suspension set-up.

Our favourite BMW 4 Series Convertible 420d M Sport

You won’t find another four-seat convertible of the BMW’s size that handles quite as well as a 4 Series, but both the Audi A5 Cabriolet and Mercedes-Benz C-Class Cabriolet fight back by having slightly more space for people sitting in the rear. That they use a folding canvas roof rather than the metal system of the 4 Series also means you get more boot space.

Alternatively, it might also be worth considering a late, low-mileage 3 Series Convertible as opposed to an early and high-mileage 4 Series – but only if the price is right.

For all the latest reviews, advice and new car deals, sign up to the What Car? Newsletter here

Shop for a used BMW 4 Series Convertible here