STUTTGART, Germany - Mercedes-Benz SL roadster family receives increased power courtesy of a new engine. The two-seat SL400 now sports 3.0-litre V6 biturbo that replaces the current 3.5-litre SL350 V6. Despite half a litre less displacement, output has risen by 20kW/110Nm to 245kW/480Nm.The V6 enables the roadster to reach 100km/h in 5.2 seconds on to an electronically limited top speed of 250km/h. Fuel consumption is rated at 7.3 litres/100km with emissions of 172g/km.LUXURY ROADSTER FOR SAMercedes-Benz SA reports that the SL400 will arrive in July 2014.According to the automaker: "Manufactured virtually completely from aluminium, the roadster sets the standards in the luxury roadsters category with its numerous technical innovations." In contrast to its predecessor, the SL400 is not fitted with a naturally aspirated engine, instead it boasts a six-cylinder unit with two turbochargers. The third-generation direct injection is supplemented by rapid multi-spark ignition (MSI); the coil is recharged rapidly and a further spark is discharged. The MSI system enables up to four sparks to be discharged in succession, creating plasma with a larger spatial expansion than conventional ignition.The SL400 sports Mercedes-Benz magic vision control wipe/wash system that takes water from the wiper blade to the windscreen as required and irrespective of the direction of wipe.The price of the SL400 starts from the equivalent of R1.3-million in the UK. Local pricing will be announced closer to launch in July.