I know that for some time Wal-Mart Supertech brand oil was being supplied by Warren Performance Products, and indeed their 10w30 high mileage oil in the red 5 quart jugs still have a "WPP" molded in the bottom of the container. But now the 10w30 conventional oil is showing up in slightly different shaped blue 5 quart jugs with "SFB" molded in the bottom. Any clue as to who is making this oil? Not that it really matters that much for a 1,500 mile Auto-RX rinse phase, but I'm curious.