Legal Question in Civil Litigation in Oregon

You can sue him for recission of the contract (he gets back the car, you get back your money) or for damages (he pays you the difference between what the car is worth and what you paid for it), based upon the fraudulent misrepresentation of the qualities of the car. Do you really have it in writing that the transmission was rebuilt? It is rare that false representations will be in writing. Was the writing signed by the seller? If not signed by him, can you prove he wrote it?

This sounds like a good case for small claims court (up to $7,500). Here is more information on how to file a claim there: http://www.osbar.org/public/pamphlets/smallclaims.html If you are in Multnomah County, call this number for help: 503-988-3022.