Reigning Bathurst 1000 champion Chaz Mostert topped the sixth and final practice session ahead of a top-10 shootout expected to be decided in heavy rain at Mount Panorama.
In a sign of how quickly racing conditions changed on Saturday, Alex Hadden lost control in the Toyota 86 series competition following practice six and rolled his car into Bradi Owen, who came off the track before the penultimate corner of the circuit.
