When buying a used vehicle what to look for, as to see what's wrong with the vehicle also what's the process in buying a used vehicle
First thing check the oil make sure that they were checking it daily or they were replacing it every 3000 miles. Listen to the engine and I don't make sure your here no popping grinding or knocking noises if its a stick car and you want to figure out of the clutch is good put the car in 4th gear and lightly try and pull the car off in 4th gear if it grabs its good if it just revs up that's a bad clutch. If possible see if you can get maybe one spark plug out and see how it looks look under the car for major rust also look under the car for leaking oil or fluids make sure that the gauges not overheating you're going to have to try and beat on it because you want pressure to go out of the engine so if there was a gasket leaking and he's trying to hide it from you you want to see it leaked so try beating on it a little bit for some oil or liquid comes out of the engine and then park it let it idle then check again for fluids lot of people try to destroy you with doing stuff like that
Good info above, I also like to get a local mechanic to look it over before purchase as they can get it in the air and look underneath for rust and pull the wheels to look at the brakes. Might cost you an hours worth of labor but worth it if the car has evidence of an accident.
An automobile is a complicated machine, and many things can be wrong with it- and they are expensive to repair- god help the man who buys a used car and doesn't know what he's doing- there are some general rules I use- don't buy a car that has a reputation for unreliability- no Audis, Range Rovers, Saabs, Vanagons, Kias- conversely, buy a model of car that has a reputation for toughness and reliability- Toyota, Honda, Mercedes, BMW, pick up trucks and most cars over 30 years old- THEN you are ready to check the individual car you have selected- find out who owned it, how many miles are on it, check for maintenance receipts and make sure it has not been in an accident- then have a good mechanic check it out- be careful- if you do not think about your purchase carefully, you are just rolling the dice- and it could get expensive, REAL expensive-