I use Amsoil. Its been tested to perform better then Mobil 1. This site proves it.
http://www.synthetic-oil-online.com/supersyn.htm

Use this if your an average driver. It shows the 0w-30 which is also compatable with the 5w-30. This oil doesn't need to be changed but, every 35k miles or once a year whichever comes first.
http://www.amsoil.com/products/tso.html

If your into racing then use this 5w-30.
http://www.amsoil.com/products/xl7500.html