'40 Willys, blown BBC, the snake oil was good for 10-12 deg. It did make a diff. on that particular vehicle! Is it a magical "elixir" to fix all problems, no!
The only ones who benefits from the sale of Snake Oil is its manufacturer and the vendors who sell it. A properly designed cooling system doesn't need Snake Oil that shit. I've been doing this old car building a long time and never used Snake Oil.
The problem for me is that I find these kinds of trouble shoot stories really interesting, I need to get out more.