B badtlc Joined Jun 8, 2006 Messages 5,495 Location KC Mar 21, 2007 #42 Royal Purple is also a group IV synthetic. No grp II or grp III.
S sxg6 Joined May 23, 2004 Messages 2,606 Location Northeast Mar 21, 2007 #43 Quote: Amsoil Click to expand... Except the XL series
