well it is "peak" oil, so it should be OK, seeing as how it probably has been extracted before petroleum stocks start to decline...
on a serious note...
peak oil is made by warren unilube, so if you are comfortable putting walmart supertech or Coastal oil into something, this should be ok.
bill, they are allegedly supposed to be selling that Q power stuff for 12-13$ to get it out of walmarts. I haven't seen it on the shelf in a while, which probably means that all of the walmarts that i have been to have discounted it to move. at any rate, valvoline is currently doing (IIRC) a $6 rebate on either 5 or 6 quarts, and mobil 1's $10 rebate on 5 is currently in play. i don't have a costco nearby, so i'll have to settle for 22-6=$16/5 for the synpower or 26-10=16/5 for mobil 1. regardless, i'm going to be hitting this up, as 10 quarts of theoretically free oil and 2 filters will find uses somewhere in das fleet.
i don't know who in their right minds is going to spend $34+ per five of that castrol edge if they are doing their oil shopping in a walmart. hans and franz's house of guibos, maybe, for lubri moly, but not walmart.