| I have AN fittings on the external oil cooler on my Subaru. Gigantic PITA. The heat will definitely loosen them up and I've had to retighten them a few times at least. Do you know the current torque on them? I seem to recall something about hand-tightening them then going another 1/4th of a turn. I don't know anything about the Z1 product, but if it's AN, then the seal is on the fitting not the thread so you also have to be sure you have matching angles on both sides.
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