It sort of doesn't matter. Just because some company blends a motor oil for Wal-Mart doesn't mean that said oil is similar to things they make under other labels. If you follow such things, there have been reports of multiple suppliers for Wal-Mart by region, phase of moon, etc.

If you want bargain priced synthetic oil from a known supplier, score some of the Shell Rotella-T Synthetic 5W-40 one sometimes sees in gallons at Wal-Mart. Some people see Rotella and immediately think diesel, but this is a dual rated gas/diesel oil and works well in most Volvos.

If you want a thinner oil like 5W-30 or 10W-30 then the best bargain in quality for the dollar right now is probably Pennzoil Platinum in the 5 quart jugs at WallyWorld. Only a couple of bucks more than SuperTech Mystery Oil and the Platinum is a first class product.

John

Depending on what area of the country it is sold, it is allegedly produced by either Exxon/Mobil or Warren Performance Products.

http://msds.walmartstores.com/cache/36155_1.pdf
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Gary Gilliam Sumerduck VA,' 94 940 Regina, '86 240GL