The old man always used the green oil. I use VR1 from day one.
All though I did try some graphite oil in the late 70's, only once, I didn't like dumping black oil right out of the can. lol
LOL. There was a lawsuit about that crap too. Somewhere around here I have some documentation of that.
DuPont refused to sell Teflon to whoever the blender was of that oil because DuPont knew that Teflon was bad. Very bad for what they wanted to do with it.
DuPont lost. I don't remember if DuPont sold to them directly or made them buy through a third party but in the end, the Teflon was sold and used I engine oil.
