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Message: <blockquote data-quote="astroboy" data-source="post: 295095" data-attributes="member: 4527">"..When this happens your piston rings aren't able to seal as tightly and you get blowby through the rings..."Then wc9922, why their tail pipe is not oily and no white smoke?Crank case ventilation is meant for what it says, ventilation and these oil vapor does not go through the the piston ring la. If not mistaken, the crank case ventilation is pipe into the intake as well right? which sends the oil vapor back into the combustion process and exit via tail pipe too, in which case, it will wet the tail pipe in the process.. but the tail pipe not wet or no smoke?I read in MotorTrader forum, there's one less than 2000km E90 320i has dropped engine in AB Glen. Customer very furious.. The forum moderator there is trying to "moderate" the situation because the customer is really upset.His 320i (Sport, I think) experience power loss at low rev and engine noise and died once. First SC diagnostic, no error reported by the OBD. Once strip the engine, found camshaft out of spec. The noise is actually caused by excessive freeplay.. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite9" alt=":eek:" title="Eek!    :eek:" loading="lazy" data-shortname=":eek:" /></blockquote>