upgrade service pack from 5 to 6 for weblogic server 8.5
I have weblogic server 8.5 (SP 5 ) running on Red hat linux enterprise server 4.5 , on 32 bit intel Xeon server .
I am using J2EE application deployed on weblogic server 8.5.
What is the best way to upgrade the service pack .
1- download new weblogic server 8.6 (with service pack 6 ) installation and deployr my app in it.
or
2- downlaod service pack 6 (if it is downloadable ) and apply to my running weblogic 8.5 (with SP 5).
Either case please state the locations as well from where i can download new installation or just service pack.
Thanks in advance