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BMW Tech and Performance
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Engine Oil: 10w40 or 5w30
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<blockquote data-quote="turbology" data-source="post: 350623" data-attributes="member: 10223"><p>Well, actually the number of X & Y indicates the viscosity of the oil at cold and hot temperature.</p><p>For the X, the lower the oil, the "thicker" it is when it is cold.</p><p>Same thing for weight Y, the higher it is, it will stay "thicker" when is hot.</p><p></p><p>That is why 15w-50 oil is possible for Malaysia weather.</p></blockquote><p></p>
[QUOTE="turbology, post: 350623, member: 10223"] Well, actually the number of X & Y indicates the viscosity of the oil at cold and hot temperature. For the X, the lower the oil, the "thicker" it is when it is cold. Same thing for weight Y, the higher it is, it will stay "thicker" when is hot. That is why 15w-50 oil is possible for Malaysia weather. [/QUOTE]
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