I have done so many used oil analyses and have looked at thousands more on bitog.com. Results:" oil is oil" . No difference between Wal-Mart supertech and Motul oil as far as results. Use a syn for extended drain intervals. I persolnally use QS Ultimate Durability. But then again I drive Subarus
More important is the filtere. Fram Ultra Synthetic Imho the best. Filters a t 20 microns vs most filters which are 30 to 40