What types of Scams do car dealers do to make a car seem better than it is?

Question by T Daniel: What types of Scams do car dealers do to make a car seem better than it is?
I am thinking of getting a 95 Cadillac Seville STS. Seems like a nice car. It drives well anyway. It is from a small dealership and a friend said that I should watch out for small dealers because they can typically do things like put saw dusat in the transmission or heavy gear oil in the crank case to allow the car to get a few extra miles out of it so it can sold faster and at a higher rate.

Japanese Car Auctions