Taking along a mechanic to every used car you want to check out can workout to be a very expensive deal. This is especially true if you are out to purchase used cars by owner which are only worth a few thousand dollars. Your time and money would be better invested if you purchased a car’s trouble shooting manual and then proceeded to give each car you look at a preliminary check. This preliminary check will sometimes requires that you slide under the car and take a look at the transmission lines and also to make sure that there isn’t too much rust under there.