black944 turbo

I have been having a bit of froth on the cap of my oil fill for a little while now. I have done all the usual tests, compression (good), pulled the plugs right after startup when idling rough ( looked fine tan in colar, not steamed clean), and still I am getting froth. Also, I pulled the manifold to do the speed and reference sensors and I pulled the breather off the j-boot and low and behold filled with froth. None of this froth smells of coolant. It smells of oil. The car does sit most of the time and is mostly driven for .5 to 1 hr. at a time. I am also loosing coolant very slowly, I am about to change all my hoses, I have a feeling that is the problem with the coolant. The car is running fine and no oil coolant mixed with oil, just changed the oil. I am still thinking headgasket, but I can not verify it with any tests that I have tried.
Any ideas?