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The BMW Range
5 Series
F10, F11, F07
Oil change interval
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<blockquote data-quote="fabianyee" data-source="post: 638595" data-attributes="member: 6"><p>Close loop? How about the ambient air (filled with dust, moisture, bla bla bla) it sucked in for combustion? Not everything goes out as exhaust gas. There are residue which got left behind and then 'cleaned' by the engine oil. Otherwise, the engine oil wouldn't need to have cleaning detergent apart from lubrication. </p><p></p><p>Anyway, me no expert on engine oil. Only know the general concept of things on surface. But to say that the engine operates in a close loop system is something beyond me. Feel free to enlighten us.</p></blockquote><p></p>
[QUOTE="fabianyee, post: 638595, member: 6"] Close loop? How about the ambient air (filled with dust, moisture, bla bla bla) it sucked in for combustion? Not everything goes out as exhaust gas. There are residue which got left behind and then 'cleaned' by the engine oil. Otherwise, the engine oil wouldn't need to have cleaning detergent apart from lubrication. Anyway, me no expert on engine oil. Only know the general concept of things on surface. But to say that the engine operates in a close loop system is something beyond me. Feel free to enlighten us. [/QUOTE]
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F10, F11, F07
Oil change interval
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