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Message: <blockquote data-quote="ALBundy" data-source="post: 103905" data-attributes="member: 15">Crymson, Magnatec is good stuff as well. The only thing about Castrol engine oil is to beware of imitations...get it from someone you know well or at least a reputable supplier.As for debate of FC and hp and etc....I think its BS. I have used Castrol RS as well....no difference in terms of fuel consumption and engine performance. IN fact..I would say the hydraulic lifter sounded a tad noisier with the RS. It has been two years since I have used mineral oil and the last time I opened up the engine valve cover to install some hot cams...the cylinder head looked clean with no slugde. That again, is my own opinion and certainly there is no harm in using synthetic oil, if you wish to splurge out a couple hundred bucks more. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" />The other thing to note is, BMW recommends lower viscosity oil for vanos engines, minimum 15W-40. For non vanos engines, its okie to use 20W-50. If I have a M engine, I would use 10W-50 (full synthetic) since the vanos system is continuous and the operating pressure is extremely high.Bottom line, you don't need to use a big chopper to slaughter a chicken <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /></blockquote>

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