Originally Posted By: buster
With a NOACK of 11.5%, RP clearly is Grp III based or contains sig. amounts of Grp III. Probably a blend like many synthetics today.
Mobil 1 usually comes in 2nd on all of Amsoil's white papers. What does that tell you? lol
Maybe you're right.. I was Always told it was 100% PAO.
Looks like RP oils are ExonMobil's Hydrogenated Mineral Oil (EHC-60), PAO, and Ester.