Used car buying guide: BMW Z4 (2009-2016)

Retractable hardtops have largely gone out of fashion with sports car manufacturers, the reason being that the weight penalty of such a complex mechanism is not conducive to engaging dynamics.

That’s a shame, really, because such an option allows you to switch at will between coupé and cabriolet yet suffer none of the noise or fragility penalties of a regular soft-top. This was demonstrated perfectly by the previous BMW Z4, which succeeded both roadster and fixed-roof models.

Happily, this model, codenamed E89 and produced between 2009 and 2016, maintains a strong showing on the second-hand market, and buying one need not make you blow your top.

The Z4 is an enticing prospect as an all-weather sports car, and its diverse array of drivetrains serves to enhance its appeal. There was no all-guns-blazing Z4 M this time, but pleasingly potent straight-six options came in the form of the 204bhp sDrive23i, the 258bhp sDrive30i, the 306bhp sDrive35i and the top-rung sDrive35iS, which made a Porsche Boxster-rivalling 335bhp so could send the Z4 from 0-62mph in 4.8sec.

However, the Z4 is equally at home as a relaxed Sunday driver, and it can be had with less demanding 2.0-litre four-cylinder powertrains, ranging in output from 152bhp to 238bhp.

You might consider buying a BMW sports car with a turbo four nothing short of a sin, but if you plan on using a Z4 daily – which you no doubt could do – these slightly more frugal four-bangers will let you pass more petrol stations, albeit while emitting a somewhat less attractive engine note.

As for the Z4’s party piece, the roof could be raised or lowered in 20 seconds – a feat that you should ensure is still possible with any potential purchase. Trouble here isn’t to be trifled with: dodgy sensors and inaccurate parameters can cause all sorts of issues, potentially leaving you top-down in the rain and with a sizeable repair bill on the cards.

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Interior: The firm ride experienced across the Z4 line-up can cause trim in the cabin to rattle – an issue that will be most prevalent on earlier, higher-mileage cars. Taller drivers might want to consider an automatic gearbox, because seat travel is limited, making the clutch pedal difficult to operate. Audiophiles may be disappointed by the efforts of the standard stereo.

Wheels: The 10-spoke, 19in alloys often crack and then gradually let air out of the tyres. This will be hard to check for on a test drive, but consider setting aside £500 for an emergency replacement set (they will add value at resale) and check your tyre pressures regularly.

Also worth knowing: BMW’s N54 straight-six engine was the subject of a high-profile class-action lawsuit in the US after it emerged that failure of the high-pressure fuel pump (HPFP) would cause the car to come to a halt without warning. The problem also affected UK cars, but most pumps were replaced with sturdier items early in the Z4’s life cycle. It’s still worth seeing how long the N54 engine takes to start, both when warm and cold, and checking for any lumpiness under acceleration.

How much to spend

£7500-£8999: 2009-2010 four-cylinder cars, some with aftermarket wheels and suspension.

£9000-£10,999: A mix of 2011-2013 cars, including some leggier 2.5 and 3.0-litre examples.

£11,000-£14,999: Facelifted models with LED headlights and interior improvements.

£15,000 and above: Well-specified six-cylinder cars, mostly in desirable M Sport trim.

One we found

BMW Z4 sDrive23i, 2010/10-reg, 69K miles, £9500: Zhaotong Li is selling his own sDrive23i, which has just been given a clean bill of health by a BMW dealership and has a comprehensive service history. It also comes with new Michelin tyres, a fresh MOT certificate and a raft of niceties including front and rear parking sensors, heated seats and electric mirrors.