I changed my primary fluid about 2 months ago and when i park its leaving a oil spot on the ground. I dont think its coming from the case itself think its coming from drain plug. The question is is there a sealant that needs to be put on the screw itself.

 

Maybe a new o-ring it worked for me

 

I put Teflon pipe sealant on the threads of the drain plugs to help it...

 

My service manual says to put a new o ring on the plug with every oil change.