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1) I think the oil pressure comes back up after the oil completely warms up after about 40 minutes. The clearance in the oil pump are very small. The oil pump I think is marginal. I thnik there must be wear. When the oil is cool and the engine metal hot it has more clearance. After the oil warms up the clearances are okay.
2) That I think is still a head gasket leak.
If you want to try and keep it running then change the oil pump and put some of that coolant sealer in. This is the stuff that's dealer sold for the 2.5L engines with head gasket leaks.
How did you do the air leakage test?
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