1. Negative Equity/Trade-In Overestimation
2. Packing (inflated monthly payments)
3. Rewritten Contracts/Backdating
4. "Gotta Put It All in One Document" Rule
5. The Deferred Down Payment Scam
6. Changes to the Advertised Price
7. Using Your Language Against You
8. The Whole Truth About Used Cars
9. So is it New or is it Used?
10. "Certified" Used Vehicles

http://www.ucan.org/gasoline_autos/automobiles/top_10_auto_scams