If there is any significant amount of oil the coolant it is usually the oil cooler that is leaking. When the engine is running the oil will go into the coolant. When you shut it off, the pressure remaining in the cooling system will now force coolant into the oil system. I have seen them leak so much that the oil and coolant both looked the same.
Leaking sleeves do not usually put any significant amount of oil in the coolant. Nozzle sleeves will leak coolant into the cylinder but no significant oil back into the cooling system. Unless the fuel system has been turned up head gasket failures are not too common.
I would remove the oil cooler and test it. I have a couple of plates that bolt on the cooler, one with an air nipple. I flush out the oil side, install the plates and apply air pressure. Stand the cooler on end and fill the water jacket with water. Watch for bubbles.
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