Drivers must be at least 21 years old, have a valid Driver´s License and Credit Card. You can also use an Internation Driver´s Permit, available for puchase online. “Officially” you are suppose to always carry a copy of the license issued in your home country with your IDP but it is highly unlikely an Argentine police officer will ask to see it.
The average rate for a standard car per day is between $60 and $100 depending on size. Be forwarned – Argentinians love to drive fast and traffic fatalities are the major cause of death for persons visiting the country.