Before we get into the secret ingredients behind Marvel Mystery Oil, it's probably a good idea to first explain that the stuff is — because it sounds like something Spider-Man would use to refill his ...

Viewer-submitted questions for The Car Doctor: Q: I perform routine maintenance on my family’s cars and just want to know your thoughts on Marvel Mystery Oil as both a fuel additive and oil additive.

John Paul, AAA Northeast's Car Doctor, answers a question from a reader curious about using Marvel Mystery Oil. AP Photo/David Zalubowski ...