At one point it was Citgo (aka Mystik) but that could have changed by now. Look for WPP(?) on the bottom of the bottle which would indicate Warren, that would likely be the same as Supertech you can buy at Walmart. Citgo bottles lack that, instead they have a red date stamp on the bottom/rear side of the bottle. Both are good products.
1985 F-250HD 7.5L 4x4 135k- Maxlife 15w-40 HDEO
04 Odyssey EX 175k PUP 5w-40
96 Maxima GLE 235k PUP 0w-40
02 Mazda Tribute 185k - Citgo 5w-30 conv.