You mean how to select a used car? or new car?
If you want to buy a used car, First you have to pay attention to their mileages. read my articles, you will know why check mileages. High mileages usually are not good, especially if the rental company own it or some rich individuals own it. For this kind of high mileages car you can buy it. Also you have to check the car history information. Hear the sound of the car, check it is right or not. And test drive it. Other factors , for example, color, style, brand, and others , you decide by yourself. if you have more questions, just ask me.