Not sure about oily (will check in the morning) but it has tiny air bubbles in it so I assumed it was air leaks and sealant?
I think it’s little bubbles of air and sealant escaping through the (porous) carcass. It happens on mine sometimes.
@TM started
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Not sure about oily (will check in the morning) but it has tiny air bubbles in it so I assumed it was air leaks and sealant?