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Message: <blockquote data-quote="astroboy" data-source="post: 350394" data-attributes="member: 4527">Gee.. I hate to disappoint u sir.. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite3" alt=":(" title="Frown    :(" loading="lazy" data-shortname=":(" /> .. because I'm not sure if the E90 4-potter is running an on-demand oil pump like the N52 and even if its on-demand oil pump, I don't know what logic it uses.Simple physic logic says that thicker oil flow slower, so slower to get it up to the head, more load to the oil pump but it (the oil) stays up longer while its opposite for thinner oil.Gunning the car on the road (with load, compare to stationary rev) would certainly help in de-carbonating the system, best do it after warming up, but as to whether it gets more oil up to the head, I'm not so sure.. I'm not surprise if u get less because like Toyota VVTi ("i" for Intelligent), when u rev, even aircond also they cut.. :42:</blockquote>