You mean you didn't learn how to take apart car engines at janitor school? Come on, if you can't fix the school bus, who will? a certified mechanic? that's bs!
He's probably just trying to score points with some chick at his vast knowledge of cars. Tell her to spend $30 and get her car checked out instead of having dumbass janitors look at it.
Google is your friend! Look, a whole forum dedicated to how to fix your would-be girlfriends car -
http://www.automotiveforums.com/f1597-_91____96.html
Now, since I don't want you to have a heart attack trying to move your gigantic slab of an arm to click on the link, here's what they said - Replacing the oil pressure switch fixed it.
Don't die!