well i dont know about the RP..but i know GC can only be found at autozone..atleast here in the carolinas..i get my oil from wal-mart..i use either mobil 1 or PP
Canadian Tire for me. Wal Mart does have a OK selection, but their fixed prices never have me purchasing any of their oils.
At least at CT, they have weekly specials that are some the lowest that I can find in Calgary. Thier oil selection is also one of the best to choose from.
Wal-Mart only, every time I price oils at other stores (O'Reilly, AutoZone, Advance Auto Parts, NAPA, CarQuest) it just falls too far out of my budget.
That, and I can sneak in a quart or two amongst the "other shopping" at WM without having to explain when the bank statements come