How oil is getting in coolant? on 2003 Mitsubishi Eclipse

Motor runs, revs, and idels great. All four plugs are clean burning no signs of oil or coolant. Im looseing large amounts of oil in coolant. Is ther any other place to check befor removing head and check for gasket or internal cracks?

Asked by for the 2003 Mitsubishi Eclipse
is your car equip with an oil cooler. if so poss leaking oil into cooling system like the older 4 runners
1 more answer
Auto trans? Any chance it's ATF?