Whenever i initially start the vehicle theres a high drilling/whining sound coming from the engine. Is this a normal warmup sound? It goes away after roughly 1 minute. It kind of "winds down" and i never hear it again. Does anyone know what this could be attributed to?

2000 S4 stock...as far as i know.

http://www.audipages.com/Tech_Articles/auto_transmission/autotran_troubleshooting.html

Here a quick reference:
http://forums.audiworld.com/s4/msgs/2408992.phtml