I will admit to using it. I have no measurable oil loss.
I make no claims.
I only use it because one of my mechanic friends likes to tell the story of one of the "company" cars was brought to him with no oil pan drain plug!!!!
All he did was put a new plug in and fresh oil, and it is still in service.
He didn't know for sure if it was slick 50 or another product, but he is sure it must have been treated, to servive without any oil.

Until I hear of negitive reports, I will concider it cheep insurance.