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Message: <blockquote data-quote="Grand" data-source="post: 426102" data-attributes="member: 6501">Went to Mspeed and Ah Meng opined that the culprit is either the valve seal or oil separator. :smokin: As replacement of the valve seal would take up to one week to complete, meng and i agree to change the oil separator first. Took his men about 1 1/2 hour to finish the job. Thereafter, voila, just a little puff of the remainder smoke trapped within the exhaust system and CAT and after a while no more smoke :rock: Will blast down the highway during this holiday weekend to further test whether the dreaded smoke will come back. But these past 2 days appear to be good. No more smoke. Satisfied with the good workmanship and friendliness of Meng. The only drawback is his workshop is rather far from my house at PJ. So my take is that it could be the cleansing agent within Shell Helix Ultra which I put in during the oil change which may have caused some deposit or dirt to be removed and clogged the oil separator which then caused it to malfunction allowing oil to seep thru :hmmmm:Will update after monitoring the situation for another 1-2 weeks. :burnout:</blockquote>