condensation in oil :/

I have my car stored here in North California while i go to school in So Cal and I believe im getting some condensation because the pcv valve has milky under and a little on the dip stick. I know its not gaskets because I took the motor out before I moved and replaced all of them. The heads are new they are RHS Magnums. My dad starts it and warms it up but doesnt drive it. is there anything i can put in the oil to prevent this from happening over and over?