I had a discussion with the service manager at the dealership where I bought my car in order to clarify just how a clutch failure would be handled in regard to the power train warranty and this is what I came away with. It is a wear item just as brake pads are, so in that sense it won't be covered if it simply wears out. However if it fails due to other causes such as a leaky throwout bearing or a transmission input shaft seal it would be. It may also be covered if it fails due to broken springs or other metal parts in the disc or pressure plate. Of course if you've been the the drag strip and running slicks or drag radials it might be to your benefit not to mention that.