talked to mechanics, they said it is ok, no problem.
I hear rotating noise when the car is warm and I am in neutral and clutch pedal released, when I depress the pedal I hear the clutch disk stop rotating.
I don't mind the noise, I just worry something is broken.
But they've said nothing to worry about.
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What I have is the upgraded Sachs clutch plate and Sachs clutch disk with organic surface (not sintered disk). Before I had clutch slip, after replacement of original clutch with Sachs I have no slip.