basically thats what u would call blow by,every motor has to breath and yeh after a good hard floggin on boost mine does the same u pull up take your oil cap lid off and look at the motor breathing..my mate services cars at his workshop that only have 30,000kms and they have blowby, im guessin its just oil vapours nothin to be 2 worried about,once u start filling your catch can with oil on boost then be worried lol