In case you haven't found your leak yet, I would suggest the Oil Pump Drive seal. Only problem is you have to go through the head to fix. I had the same problem on mine. Had a GM Mechanic help me with it and he was able to jimmy a fix that didn't require going through the head but it was a little complicated.
If you would like the details, send me a message and I'll try to describe the best I can. The leak started as drips and was only happening while the car was running. After a year or so, it was a puddle in less than 5 mins.
Thursday, June 19th, 2008 AT 7:41 PM