Needing a car for a stay of longer than 31 days get a long term car hire from Drive Africa
http://www.driveafrica.co.za/ supplied with one of the major car rental companies in South Africa. Up to 3 months it's a winner. After that you need to think of a rental purchase buyback with guaranteed buyback as it will be 60% cheaper than renting a car. So visit the website and choose a car for your long term stay in South Africa