I know the oil question can cause a lot of debate so i'm not gonna start much.
Here is an older link that i'm sure has been posted before. I thought it was a good article.
So i'm reposting it for anybody that may have missed it.

Enjoy!!

http://www.sportrider.com/tech/146_0308_oil/index.html

 

god i hate sport rider articles. their articles have no decisive conclusions ever. oh well it was an interesting read, thanks man