He is an article i ran across last year and thought it would be of some use to the members on here it is a lil long but well worht the read it was writen for the trucking industry but offers some of the best info on the use of synthetic oils the CJ-4 oils
Are You Using The Right Oil?
that is the link to the page but if it does not work it is in the august 2008 issue and you can reach it thru the archive on the heavydutytrucking site
Again i hope this will offer a lil clarification on the oil ?'s alot of people have