Hello everyone:
My Volvo S40 1.9 Turbo 2000 model, has a lot of oil mixed in the cooling system, it spits expansion tank, and filled the radiator, hoses throughout the system, but no mixture inside the engine, the car turns and walks perfect, without flaw, but is heated by the cooling system being clogged with oil mixture in the water.

This means bad head gasket?
Turbo wrong?
It is the oil cooler?

It is not transmission oil.
Is motor oil, unused because they consume the car.

Thank you for your help.