Not only soaks into the metals, it dissolves carbon like it's goin' out of style!
I've used Mobil1 5W-30 w/ Motorcraft filter for years now. I treated mine once and after 6K miles found the drained oil to be visually darker compared to previous and subsequent oil changes.
Only oil additive I would ever use but, not something I would use every oil change due to the $38 oil/fuel treatment kit cost.
I might use Rislone on a '60's or '70's if need be but, Snake Oil? There's a little more to it than that.
GT