i just picked up some gc all are M0507 so i guess its all gold. i do have a couple of questions about gc and bc. i think i saw some bottles of made in usa 0w30 is this the same oil as the german? i searched and i just want to get a final answer to what i think i read. the 5w40 bc that is made in belgium is a group III oil and is not on the same level as gc, right?