1998 Mitsubishi Eclipse HELP! Motor oil going into radiator

I recently noticed my car is leaking its motor oil into the radiator. There is no water in the motor oil and the transmission oil is at it’s appropriate level and such.
What are the causes and how can they be fixed?
Thank you

Hi Rockcar,

I would have to guess a blown head gasket. Not an inexpensive repair, I’m afraid.

Alrighty. Thank you so much for your help. I appreciate it.