They also have information on crash tests, child safety seats and airbags. Premature surface rusting could be a sign that the vehicle was in an accident and that it has been repaired. Typically, Automotive Manufacturers warranty cars for any rust perforation for up to six years. This is usually an indication that something is wrong and that a qualified mechanic should check it out. If possible, check the parking spot in which the previous owner parked the vehicle for signs of leakage.
Blue smoke is usually an indicator for burning oil.
Black smoke tells you that the fuel is not being burned properly and that it should be tuned up. White smoke is an indication that the radiator fluid or Ethylene Glycol could be leaking into the combustion chamber. If they used a premium or higher-octane fuel, which contains more detergents to keep the fuel injectors clean, then this is a good indicator that they took care of their vehicle. If the vehicle was in an accident it is the responsibility of the individual selling the vehicle to disclose the information. Any misleading statements on the part of the vendor may be used in a Court of Law if otherwise determined by the buyer.