I use Amsoil exclusively in all my cars as well as my families cars. So far it hasn't let me down yet. My dad drove my 89 Chevy S10 Blazer without any oil or water. He hit a 2X4 on the highway and it punctured my oil pan and tore a hole in my lower radiator hose. It was running very hot but the engine is still working today. That was four years ago and the engine is smoking a bit but still working.
I do a complete drain once a year but I change the filter once every three months like clockwork.
Here is a link for the Amsoil Oil I use. http://amsoil.com/products/tro.html
Here is a link for a comparison between oils.
I hope these links helps everyone. I know I am sold on Amsoil.
I would be very interested if anyone has horror stories about Amsoil products. I have had good luck with them. On paper, they are all similar and it comes down to personal preference and I prefer Amsoil.