It has a well-insulated metal roof that you can raise or lower while the car is moving. The cabin is nicely finished and standard equipment is generous.
The handling isn’t that agile and petrol models have high running costs. The rear seats are best for children.
What it’s like to drive, and how quiet it is
BMW 4 Series Convertible performance
The range comprises three petrol editions – the 181bhp 420i and 241bhp 428i (both four-cylinder units) and the 302bhp six-cylinder 435i. There are also four diesels: the four-cylinder 420d and 425d (181bhp and 215bhp respectively), and the six-cylinder 430d (255bhp) and 435d (308bhp). The last of those units is available only with xDrive four-wheel drive. We’d stick with the 420d, which pulls strongly from low revs and feels comfortable both in town and on the motorway.
BMW 4 Series Convertible ride & handling
The 4 Series Convertible’s steering is meaty, consistently weighted and accurate, but the car’s weight (it’s still the thick end of 1800kg) means that it’s not entirely happy with sudden, rapid changes of direction. It is comfortable, though; even in sporty M Sport spec, the suspension does a decent job of dealing with road imperfections. The car’s structure is also impressively stiff, so it doesn’t shimmy and shudder too much over scarred surfaces.
BMW 4 Series Convertible refinement
BMW’s six-cylinder petrol engine has a reputation for smooth running and, sure enough, it’s suitably hushed once you’ve got the 435i Convertible up to speed. The four-cylinder 420d is a lot noisier, especially when revved hard. You’re unlikely to be bothered by engine or wind noise with the roof up, although there’s a little too much road noise at speed. There’s also some buffeting with the roof down, but in general the Convertible’s cabin is a refined place to be.