Lexus will stage the Australian debut of its new RX 350 at the 75th annual Melbourne Motor Show that runs from 27 February to 9 March at the Melbourne Exhibition Centre. The 2010 RX-350 is fitted with an upgraded 3.5-litre petrol V6 engine that develops 204 kW / 275HP and is mated to an electronically controlled, sequential-shift, six-speed transmission which replaces the five-speed automatic of the previous model. Along with the RX 350, the Japanese automaker will also show its LF-A Roadster concept