Hard 4 me 2 remember back then but I want to say it was a QS product.
I do remember later and a few cars & trucks later, when I went to switch to a synthetic (want to say Mobil oil) in my 65 GTO, I took it out a couple days later because it seemed like water compared to the thick dino I was using then. My 1st time trying it and didn't know what to expect - I think that was around late 70s.
That was when I was messing around with the 6-pac on that 389 and ended getting my hair on fire and burning a little off.