today the weirdest thing happened when i was driving....
i went to pick up a my bro at work.. after about a 20 minute drive the car was all warmed up everything was fine...
coming to an intersection the light was turning yellow so i floored it to make the light anyway 3 seconds later i look at my guage and the engine temp is almost on red... then another 5 seconds later it drops quickly back to normal...

what could have caused that? is this forsight for a bigger problem in the future? might it have something to do with my o2 sensors needing to be replaced?

thanks guys

check this:
http://www.bmwtips.com/tipsntricks/JC/Overheating.htm

then see this:

http://forums.bimmerforums.com/forum/showthread.php?t=682975