A rental car is a used car, just like any other car, though rental cars from a reputable firm are probably better maintained than many privately owned cars. When you rent a car from the top companies, they are clean, and very rarely does a rental car break down. These companies tend to take vehicles out of service after one to two years, and have already absorbed the largest portion of the depreciation. Sometimes the used cars from car rental agencies still have their factory warranties in affect. Some car rental agencies may even provide a limited warranty on used cars.