I had about 3oz drain out. I then took a plastic straw and fit it into the dip stick fitting. I blew into the straw and about another 1/2oz came out. E-mailed Vortec and they basicly said as long as you are getting at least the 3oz out and re-filling to the proper level, that is good.
1st IPF Supercharged
2011 2LT/RS RJT Convertible