blue smoke every now and again

just done an oil change i think i may have slighty overfilled it wit oil only a small bit i used the same oil i always do 10w40 mobil 1 high proformance. when i am driving my car i stil get full boost and there is little or no smoke. when i stop it seems to let out some smoke sometimes den other times nothing. im not talkin major smoke jus a nice poof. i reved it and when ye put the foot down no smoke den sometimes lets out a bit could this be to do wit the turbo i only had it off few weeks ago looked perfect no play in de shaft nothing?
 
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