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I just finished replacing my oil cooler lines. Before starting anything, check both oil lines and find out which one is leaking, because the oil thermostat is probably NOT leaking. If you replace the line(s), try not to remove the thermostat as the replacement gasket tends to fall out, slip, as you are trying to put it back on! Plus, the forward T40 screw is under the serpentine belt and a 3/8 ratchet won't fit properly during install.
There is also that pesky 10mm bolt holding the oil cooler lines to the block. The sages all suggest removing the compressor bolt for better access. LOL. That 14mm bolt wouldn't budge for me. It took me 1 hour to remove the little 10mm bolt. Putting it back on? Lots of luck, unless you take off the intake manifold and reach it from above? Or have small hands to get it from below.
There is a T30 screw holding the cooler lines to the thermostat. Access to that screw is non-existant with the thermostat still in place.
You mentioned a cold moan from the thermostat? I have never heard of that before. How did you diagnose the noise emanated from there? The wheel has to be off and the cover lifted to verify the noise came from there. There is a flap in the oil filter that could make the same noise, same area on the car.
There is nothing serviceable in the oil cooler thermostat. A heat activated spring and rod.
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