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Message: <blockquote data-quote="Iceduke" data-source="post: 621508" data-attributes="member: 3721">Hi bro Ibrahim, refer to item no. 4 in this link <a href="http://realoem.com/bmw/showparts.do?model=AZ72&mospid=47632&btnr=11_3176&hg=11&fg=25" target="_blank">http://realoem.com/bmw/showparts.do?model=AZ72&mospid=47632&btnr=11_3176&hg=11&fg=25</a>. Its a common wear tear item on n42 engines partly also coz of its design as the spring sits on it hence the revs will in time wear it out. If you DIY, just remove your spark plugs and if there are oil on the threads near the firing point then its most likely it. I changed the vacuum pump and spark plug plastic tubing oil seals and it still consumes a little and my plug threads are oily as well so I deduce that its the valve seals that need some work. For temp solution I believe changing to a thicker oil like 50 / 60 will help.</blockquote>