It should go off when you press the brake pedal, as it checks the brake lights to make sure they are working.
If the oil light on the panel comes on, it means you are 1 quart low on oil, not that you don't have pressure so don't panic.
<img src='http://home.comcast.net/~quincy56/isabelle.jpg' border='0' alt='user posted image' />
<a href='http://home.comcast.net/~adamsjohn/325ic/isabelle.htm' target='_blank'>1992 Cabrio 50k mi - Isabelle</a>
<a href='http://home.comcast.net/~adamsjohn/Otis/otislives.htm' target='_blank'>1989 325i 177k mi - Otis (Handed down to daughter)</a>
2001 Ford Taurus 63k mi - POS - Wife's car