Thanks for clarifying. What's a C-store? Cosco?Actually, SAE specs viscosity ("weight"). API and ILSAC specify the other qualities that make an oil "SP" and/or "GF-6". Those are not regulations, they are standards/specifications. Which means old, obsolete specs like SA or SE can still be sold. Watch out for unknown brands on C-store shelves.
You mean unknown brands like SuperTech?