While Walmart's SuperTech Full Synthetic 10W30 Motor Oil manufacturer is not confirmed, sources suggest that it was produced by various oil blenders.
Unofficial sources suggest the oil is formulated and blended by Warren Performance Products or WPP, which is one of the largest independent oil blenders and also a wholesale distributor for various automotive products in the U.S.
Others said that it is made by Pennzoil and repacked by Walmart.
Another possible maker of this oil is the CITGO Petroleum Corporation, as a document from Walmart states that this company is the supplier of the SuperTech oil. Refer on the document below.
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Mineral vs. Synthetic, which one is better? Find out more about motor oil at Super Chevy.