[AdiP]

I really doubt that oil spraying nozzle is cause... Is more an electrical cause, like loosing a spark from a cylinder. That issue is very rare and for a few miliseconds, like I said, but exist. I could live with it but my OCD won't let me.
Are too much variables involved, power commander, full exhaust... Seeing recalls and numerous coil issues on k67 I've presumed that is most probably cause... I'll try to eliminate PCV and see if this will happen. On the other hand, as I've read, ISTA should show spark coil failure. But isn't like dead dead...