Have a 2000 ford ranger with a 3.0 engine. Getting engine oil in the cooling system, but no water in the oil or trans fluid. Any Idea's beside cracked block or Head gaskets?

Thanks

 

are you sure it's motor and not atf? years ago had volvo diesel that got atf from radiator into water it was oily could not tell it was atf just oily.disonnect trans. cooler in radaitor, plump auxillary trans cooler, flush cooling system.