Castrol Syntec and Heavy.com is sponsoring the Unlock Your Power Sweepstakes where you could win $5,000 to upgrade your car. Technically, the prize is a $5,000 American Express Gift Card – so maybe you could spend it on whatever you want if you’re not that into cars? Enter by December 31, 2007 for a chance to win.

Enter the Castrol Syntec $5,000 Sweepstakes