I use Gulfpride AFE 5w30 synthetic blend often. It is our bulk oil. I have been very impressed with its performance.
American Refining Group, the makers of Brad Penn, held the license to blend Gulf lubricants up until a couple years ago. Gulf now licenses their lubricants to Nu-Tier Brands. Nu-Tier is a company that was started by some Citgo guys and Lou Polsinello of Polsinello Fuels.
I contacted them recently and their customer service stated that ARG no longer blends Gulf oil. They would not tell me who does.
Either way, Gulf is a great oil.