Guys buy used cars only from authorized dealers and guys most important thing is that do not ever make any advance payments because the opposition party may fool you. Moreover, do some research about the car that willing to buy and guys make sure the seller has the complete documents for the car like registration certificate, pollution under control certificate. However, do not make the purchase if the seller does not have a id proof. the seller may sell you theft car putting you at risk and keep in minds your safety is in your hands. Furthermore, the most important thing is that check the car is there any dents on it or check the condition . Check whether the components inside are working properly or not Like, A.c Blower, Power steering, windows, gear lock and door locks, speedometer etc. Guys once both the parties are agreed you may proceed to pay. Do not make payments through cash, to avoid miss happenings sign a contract and only then pay the money so these are the tips guys when you purchased a used cars.