No thats not self oscilation. People here are getting confused between self resonating (resonant filter) and self oscilating filter.
All filters have cutoff, resonance, envelope amount etc etc. This is termed as a resonant filter.
A filter which self oscilates means when u turn the resonance up u can hear an audiable sine wave >>
http://www.macbethstudiosystems.com/...ine%20Wave.mp3 This sine wave can then be modulated by additional lfo's etc etc. Self oscilation is a useful tool and created additional movement in ur synth sounds.
DS