1991 Pontiac Firebird- a lot of oil in water of coolant holder(radiator), what

[Robert]

could be the problem? the oil temperature gauge is high and when opened radiator cap after sitting over night, liquid pretty much shot out and was a mixture of oil and water but mainly oil. then removed hose between coolant tub and radiator and all the mixture was mainly oil coming out, what are all the problems that could be causing this?

 

[melsg5]

sounds like a blown head gasket or I believe that engine may have a gasket between intake and head that can cause that same problem