If it is a CI-4 oil, it will run perfectly fine in your '05. CJ-4 oil is the newer, low emission stuff, and it is made for the new 2007+ trucks. CJ-4 is OK to run in your '05 as well. From what I've heard, oil companies have had to compromise oil quality a little to meet the new CJ-4 standards, so the CI-4 stuff is preferred for 2006 and older trucks if you can still find it.
My . 02
-Chuck