I would not touch Slick 50 with a 10 foot pole.
Read about the
FTC lawsuite against Quaker State (the owner of Slick 50) due to misleading advertising about
improved engine performance and reduced engine wear.
A good article describing problems with Slick 50 and similar additives is
Snake Oil! Is That Additive Really A Negative?
More interesting info is in this article,
The not-so-clever classic oil additives
Engines were designed to use engine oil, not Teflon.
