The 3s' are old news as far as SuperGT Goes.....sorry to burst your bubble. As a matter of fact i don't even think the castrol supra is even competing any more...don't quote me on that one though.
http://www.japanesesportcars.com/sport/cars05/gt500/esso-ultraflo-supra.php
http://www.japanesesportcars.com/sport/cars05/gt500/eclipse-advan-supra.php
http://www.japanesesportcars.com/sport/cars05/gt500/yellow-hat-yms-supra.php
http://www.japanesesportcars.com/sport/cars05/gt500/dynacity-toms-supra.php
http://www.japanesesportcars.com/sport/cars05/gt500/denso-sard-supra-gt.php
http://www.japanesesportcars.com/sport/cars05/gt500/esso-ultraflo-supra.php
http://www.japanesesportcars.com/sport/cars05/gt500/eclipse-advan-supra.php
http://www.japanesesportcars.com/sport/cars05/gt500/yellow-hat-yms-supra.php
http://www.japanesesportcars.com/sport/cars05/gt500/dynacity-toms-supra.php
http://www.japanesesportcars.com/sport/cars05/gt500/denso-sard-supra-gt.php