Transmission fluid
 

Any suggestions for anything better to run in a 2011 ZR1? I track the car and would like to have the best fluid in there.
I've noticed that the clutch when its hot doesn't like to disengage properly and lock itself out of gear. Once it cools down its smooth as butter. I am trying to get the old fluid out of the clutch and get wilwood fluid in there, but it takes awhile to get it all swapped out.