Bonus 1 — Used Car Inspection Checklist
Print this list or copy it to your phone. Take it to every car you see and mark what you find. It doesn't replace the inspection by a trusted mechanic, but it helps you rule out cars with obvious problems and negotiate with information.
Bonus 1 of the guide "How to Buy a Used Car Without Getting Scammed": 10 pages in PDF. You can buy it on its own, or get it included in the bundle with the guide and both bonuses.