While out and about today I stopped into the Vista, Ca Autozone on No. Santa Fe. Found a rack full of GC. Scored myself 6qts of M0502 and 6 of M0504. When I left there were still 4 more M0504's there...
As I have said in other threads, I think Castrol is importing this oil (plus BC) to meet a "target audience" (and if others happen to buy it, all the more the better). As long as that target audience is buying--and it doesn't turn out to be more cost effective to produce oils with their specs in the US--we will continue to see GC and BC.