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Message: <blockquote data-quote="astroboy" data-source="post: 375708" data-attributes="member: 4527">Confirm! I have check both N46 and N52, the valve cover breather hose is connected to an oil separator. Oil separator has top outlet and bottom outlet, bottom outlet is connected back to the oil pan while the top outlet is connected back to the intake manifold.But if the oil in gas state is fed back into the combustion chamber, the tail pipe should have lots of carbon deposit or oily as byproduct of burning oil, even in gas state, we are talking about 1L every 7~8k km which is a lot!If the above is true, adding an oil catch tank after the oil separator should prove something.. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite11" alt=":rolleyes:" title="Roll Eyes    :rolleyes:" loading="lazy" data-shortname=":rolleyes:" /></blockquote>