Checking the used car history report is a must. It does not give a sure shot warranty of the cars credibility but it can save money if it shows any bad records, like if after an accident it was written off or a roll back of an odometer. Then ask someone with car knowledge to take a look at the used car in question that might save a lot of money for the buyer.

What one should not do is to buy used car right after it has met with an accident especially when it was head on. The problems that might occur with that are innumerable. Do NOT fall for love at first sight! Take time to see and examine the used car and test drive for there are several different problems that may arise when the car is on, at speed or when the engine is cold. No decision ought to be based on the words spoken by the dealer. They are trained to lie. 

If the car is in need of a minor repair or something of the sort then bear in mind that such is never the case and the buyer ends up spending big money and the needs never seem to end. Another used car not to be bought is a flooded car. At first, it may appear just fine but then later it develops electrical and transmission problems which require expensive visits to the car doctor (mechanic). Being rude to the sales person never helps. Be persistent but not inconsiderate, show them your good side and they will jump to help.