BMW has revealed a "mid-life" facelift version of its Z4 Roadster that will hit Europe's showrooms in March 2013 and South Africa three months later.The Z4 is BMW’s only two-seat convertible and from 2013 the range will include an entry-model sDrive18i and a Pure Traction Design high-spec package.DE-TUNED ENGINEThere will be five standard Z4 models - sDrive18i, sDrive20i, sDrive28i, sDrive35i and sDrive35is - with UK prices ranging (guide only for SA) from about R373 000 to R620 000, the top three equipped with an auto box and artificially limited to 250km/h top speed.Image galleryThe Z4 sDrive18i engine is, BMW says, a new entry point into Z4 ownership and has a de-tuned version of an existing two-litre four-cylinder twin-scroll turbo engine capable of about 117kW at 5000rpm but still a sub-eight second time to 100km/h and top speed of 220km/h. General fuel consumption is listed as about 6.8 litres/100km.Some of the current engines, BMW says, have improved on overall performance. The sDrive20i comes with a 140kW engine and is expected to take about 80% of sales.Then come the four-cylinder twin-scroll turbo sDrive28i, the six-cylinder twin-turbo sDrive35i and the sDrive35is, each well into the performance-car stakes with engines producing, respectively, 180, 225 and 250kW.A six-speed manual gearbox is standard, alternatively an eight-speed auto with paddle shifts or, on the Z4 sDrive35is, only a seven-speed double-clutch transmission, again with gear shift paddles.SE and M Sport derivatives will continue to be offered in the UK.STYLING CHANGESAll the next BMW Z4 models come with facets of BMW’s award-winning EfficientDynamics programme, technologies that BMW says improve engine performance while reducing fuel consumption and exhaust emissions. Among them are braking energy regeneration, electric assistance on the steering, low rolling-resistance tyres, on-demand control of the engine’s ancillaries and a gearshift indicator on the manual transmission cars.Most of them have been in use for some time.There are few styling changes for the 2013 versions. The headlights will include white diode corona rings and a white eyebrow with additional chrome detailing but no eyelashes, the "gills" get chromed detailing and diode indicator repeaters.Then there's the Pure Traction Design package... (BMW's capitals) in only one colour, Valencia Orange (unless, BMW says, the customer wants another colour, which is kinda strange marketing, but whatever) with an optional contrasting black roof. This model will have Alcantara/leather sports seats, 'anthracite' headlining and a unique metal-weave cabin trim.The package costs the equivalent of about R7500.TWO ALLOY RIM STYLESStandard across all models will be DAB radio, xenon headlights, Bluetooth, USB connectivity and Sport multi-function steering wheel. All models apart from the new entry-level sDrive18i SE will have leather upholstery and three new body colours are available - naming them is pointless except they are two variations on grey and silver and the Valencia Orange - ask your dealer.Two styles of alloy rims will be in the catalogue, 17" and 18".The Z4 was the first BMW roadster to have a two-piece, electro-hydraulic folding hard top and the first with adaptable suspension. In the market for a new car? Start your search with Wheels24’s exclusive all-brands tool to compare prices!