I'm right in the middle of a head gasket change right now, which started a year ago as a bit of oil in the antifreeze. I thought, this should be the other way around, why don't I have milky oil???? The gasket was rotten with some of the metal rings around the cylinder pushed oblong, and one rings beginning to disapear. Although foolish me waited untill it puked its coolant all over the convenience store parking lot to change the gasket (i really did'nt want to touch the maze of vacume lines and wires and things I cannot conceive a use for). (but it was'nt that bad once I got into it.) Good luck with your trouble shooting.