On the Wednesday of the season opening race in Australia, an official complaint was launched by the seven other teams against the rear diffusers of the Williams FW31, Toyota TF109 and the Brawn BGP 001 saying that they were illegal.
On the Wednesday of the Australian Grand Prix's opening race, seven other teams lodged a formal complaint against the rear diffusers of the Williams FW31, Toyota TF109, and Brawn BGP 001, claiming they were not in compliance with regulations.