Not sure who is making it now since they went to the new jugs. Citgo was making it. I do think it is Warren Dunn, NC since they have made it for RK in years past.
It's kind of like Supertech. The synthetic is still made by WPP. The conventional I get around here now is made my Amalie in Charleston, SC. WPP and Amalie are both using the same jugs. Makes me think WPP is in with Amalie to some extent to blend and supply oil. Not sure either way...just guessing. Before the Supertech jug change, the bottom of the jugs were plainly marked as WPP...even the conventional.