Just curious if anyone has done an analysis (or their opinon) of "store brand" vs. "name brand" oil. Specifically, I worked for an auto parts chain where "their" store brand of oil was in fact Valvoline? The one i'm keenly interested in is "Super-Tech" from Wal-Mart and how the synthetic measures up against say Mobil-1, Pennzoil, or Syntec. If it's close the $4.50+ vs. $2.97 USD (here in the Banana Republic. would be a nice cost savings for 3 vehicles. BTW I use Puro 1's in all.