1990 corolla, oil in radiator and not over heating?

i just bought the car and I check the radiator fluid level and there appeared to be oill in it. The cars not over heating at all and there is no loss in power. The car is actually running cool. Is there anything else it could be rather that cracked head, block or just head gasket?1990 corolla, oil in radiator and not over heating?
The repair garages have a ';sniffer'; tool that smells the antifreeze in the rad for carbon monoxide. It can tell right away. If that is present, then it is coming from a cylinder....so you do have a leaking head gasket.





Where else can the oil come from? Nowhere unless someone put oil directly into the rad.





In any case, you do want to get if fixed. You do not want antifreeze in combustion chambers. It does damage.1990 corolla, oil in radiator and not over heating?
is vehicle a manual or automatic transmission,if automatic check tranny fluid,fluid cooler inside radiator tank.