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There is no exact answer to the question as Walmart sources its lubes from different suppliers depending on location. Most of the dino oil is packaged by Warren. Generally, you will see a W on the bottom of the bottle or the name Warren. In other parts of the US, the formulation is identical to Exxon Super Flo without any trace element. The synthetic is mostly Warren Gp III dino synthetic but again you may also find some bottled by Safety Kleen which is a recycled Gp III, which actually is a good oil. All of Wallys oils met minimum API standards and have weak additive packages. As long as you are aware of this and change oil around 3500 miles or so the engine should outlast normal ownership. There are quite a few engines on the road today using Wallys oil that have exceeded 200,000 miles. Kinda makes synthetic a rip off. Your engine, your money, my .02