Funny story - My brother-in-law was put in charge of a service station for graveyard shift while he was going to high school. He knew NOTHING about cars, just how to pump gas. (This was in the 'full sevice' 60s for the younger members of the board). One day he asked me if he did the right thing for a guy who needed brake fluid. He used some red fluid (I guess it was tranny fluid). I told him, "No, that wasn't quite right. Your customer will probably have a catastrophic failure of his entire brake system in, oh, about a monht's time."