That noise _might_ be due vibrating FW assembly. Of course, impossible to say without opening the clutch.
And yes, slipping seems to happen only after the car has been driven approx. 1h.
Yes, broken 2-mass fw causes clutch slipping during a certain gear/rpm range. On standard 1.8t this is 3500-4000 rpm / 5th gear.
2-mass flywheel has a moving inner plate for dampening the clutch disc operations. Dampening is done -- at least partially -- with some silicone type mass, which...
Broken dual-mass flywheel causes exactly the above mentioned type of slipping. Having engine oil on the clutch surface would require the broken crankshaft sealer/washer, which is very uncommon.
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