Lonestar: The identification number for the plastic was on all the bottles and jugs. The triangle with a 2 for HDPE (high density polyethylene) was on the bottom of the containers. I suspect that motor oil, much the same way that gasoline, is now made by a few refineries left in the USA. The C, G, Q, WPP, and WSE are the manufacturers for a lot of major brand oils as well as big box store brands. Does anybody know the manufacture of C, G, Q; the WPP and WSE stand for warren. Have a great day, StringerOne signing off.