Don’t know if it’s been mentioned in this thread, but back in the 80’s people were (still are) buying B&M “Trick Shift” for $8 a quart (back then!) and it’s just Type F dyed blue. I fell for it once.
I mentioned it in my answer. People were buying that snake oil in the 70's as well. Probably 50 years and they still sell it.
In theory, there is no difference between theory and practice. In practice, there is.
