Assuming no major changes between a 3.9 and a 4. yes oil leeks from the head gasket at the back of the head are not that uncommon.
oil comes up the front of the block and into the head. since the heads are the same ( no left or right) the heads have the oil hole in the back as well, but there is no corresponding oil hole in the block, the head gasket seals this and seems to fail with age.


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) and I took a look underneath the motor and saw coolant stains on the front diff. There was a bit of oil and accumulated greasy gunk stuck on the webbing on the block. I bought extended warranty and asked them to fix the amigos before I picked it up. I caught the train down to Sydney and picked it up a few days later.


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