what oil to use

2shelbys said
As that says, their very first synthetic was non-PAO. Everything they make now is PAO.
Click to expand...

Not the way I read this.
http://www.amsoil.com/articlespr/article_xl7500.aspx

http://www.upmpg.com/changes_xl-7500.htm

But that's today.
Tommorrow may be different.:-k