I don't put any additives in my oil or gas.

I've been using Penzoil since 1958, I've never lost an engine or had any
problems.

I run 8 oz of Marvel Mystery oil with my oil for a few days before each
oil change to clean lifters and remove gum that builds up inside pistons
and crankcases.

I use fuel additives only when I suspect water in my fuel.

FuFu juice is a really great high profit business most FuFu is used to
hide some problem when a seller wants to disguise a problem with an old
clunker.

You cannot chemically repair any broken or worn parts with FuFu juice.