Those individuals or professionals who want to accede to a vehicle in good general state and that she has been maintained and repaired in official services of the authorized mark or factories, are a good opportunity for them the cars of occasion of renting. The total of kilometers realised in the occasion cars renting, usually is not high, being able to more always make still many in accordance with the motor and corresponding piston displacement. The departments of vehicle of occasion of the companies of renting and the professionals of sale of occasion vehicles, are those that are normally in charge to commercialize the cars of occasion of renting. When soliciing information, is very advisable to ask questions as the book of revisions updated, the correct kilometrage and them inspection of itv to the day, as well as the formulas of financing available and the period of guarantee for the car. Another variant, is the denominated Rent-Back, that consists of the acquisition on the part of the company of renting of the vehicles property of company-client by an amount that usually is the reduced value of acquisition amortizations. When a company wants to transfer its fleet of cars in property to renting to release assets of the balance and to accede to a capital injection that can destine to own investments of its business, the denominated Rent-Back does. Including in this quota the corresponding costs of maintenance, insurance, tires, attendance in highway and other services additions, the company of renting will be able to buy the cars in property and will complete the Rent-Back having calculated the quota of renting based on and the kilometers of the time of hiring. This supposes a series of advantages as the elimination of the administrative management of the fleet, the conversion of variable expenses to fixed and avoids disadvantages futures as they are the obsolescence of the vehicles and its difficult sale in the market of second hand.