If you changed the head gasket and now the antifreeze is mixing with the oil more than before what could be the problem?

1 reason could be that the cilynder head is warped or cracked.(hairline crack is all you need)

there could also be a broken gallery/passage some where in the engine block.if the vehicle is not smoking white I'm going to assume that the two are mixing some where in the engine block.

Did your engine oil change color(milky white) or the coolant/antifreeze itself appears to have oil in it(like mud). these two symptoms may indicate diffrent causes.

AnswerDepending on the engine, some intake manifold gaskets can also cause this. Make sure this is not the problem .Mark