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Message: <blockquote data-quote="astroboy" data-source="post: 555292" data-attributes="member: 4527">Most white smoke cases is due to valve seals:N42 valve seals, item 4 below.<img src="http://static.bmwfans.info/images/epc/ODQwNDFfcA==.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /><img src="http://www.rmeuropean.com/Images/products/large/11340029751_VIC_CA4918F1.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />This is a wear and tear seal just like any other oil seal. Piston ring not so easy to wear unless you use sub standard engine oil over prolong oil change interval and suffered from over heating before.My old Perdana I4 16 valves suffered from 4L top up every 5k km traveled. So I literally no need to replace engine oil.. also made me sweat when hearing need to overhaul suspected piston ring. Wife prevented me from fixing because 12 years old car, so pestering me to replace car. Selling the Perdana also difficult because smoking ma, until had to fix too. End up getting my foreman to replace just the valve seal to see how.. the seal cost me RM3 each and there 16 seals for all the 16 valves. Seals plus labor cost was RM200 and to my surprise, it fixed the smoking and oil loss problem.. still we sold the off because found the now beautiful E90.. :4:</blockquote>