On a related note
I don't think I would buy a used or pre-owned car unless it was certified (I feel like most used cars I've seen on dealer lots are), and came with an extended warranty. I'm seriously not a fan of the idea of buying someone else's lemon... And now onto a lemony note, I know someone who had bought a used 2002 model year Buick from a local Chevy dealer, and the car had apparently come with a warranty because the thing had a bad tranny that they couldn't get working right and gave the person loaners for 6 months.
I wish they weren't a Chevy dealer cuz I would give them my business for that kind of service in return. (To me Chevy is like the Whirlpool of automakers, and I don't care for Whirlpool if anyone hasn't noticed)