To get the castrol corvette, got to your most completed career file, load it and buy a corvette. Next go to the performance shop and go under 'visual' and paint it black, then go to decals and put the castrol decal on the windshield, rear window, left door slot 1 only!, right door slot 1 only!, left quarter panel, right quarter panel. then go to vinyls and put on stripe 1 then buy all that and youve got your very own cstrol corvette c6...on your career mode!

Note: You can do this to any of your cars and you will have as many castrol cars as you like!.