Its a problem because its not professional. Popping dye in it before putting car on the lift, bravo
you obviously don't know much about cars then.
i've been fixing them for 27 or so years. dye is the best way. when you go under it, if it's been driven at all, the oil will be spread all over the place, making it impossible to determine where it came from......assuming it isn't pouring out.
i've never had a customer complaint, because i put dye in their oil. i have had some say it was a great idea, as it makes it more visible.
just an FYI, the dye will NOTturn your oil green to the naked eye..
so...back to the original topic........clean it, put dye in it, run it, use the uv light, and find the leak.