An often overlooked avenue is for sellers of cars. The seller, particularly the original owner should have service and repair records - great information to show the value and remove doubt in the mind of potential buyers. Services like DriverSide in the United States and DriveArchive in the United Kingdom are trying to create tools to help car owners track this service information.
There is much confusion about the availability of "free vehicle history reports" or "free Carfax reports." None of the vehicle history reporting services in any of the countries listed above offer the service for free. Several of the services, most notably those in the United Kingdom and the United States, sell reports to dealers and then encourage the dealers to display the reports on their Internet sites. These reports are paid for by the dealer and then offered for free to potential buyers of the vehicle.
Article source: htttp://en.wikipedia.org/wiki/Used_car#Sources_of_Vehicle_History_Reports
