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Message: <blockquote data-quote="astroboy" data-source="post: 273080" data-attributes="member: 4527">Rule of thumb is first look at your user manual and see what does it recommend.. next look at SC and see what they give when u sent her in for service.. look at the service bill from SC if ur car has a service history.. from there u'll know at least whether its 5w40 or 5w30...Our E90 service record says its 5w30... so I figure it would be the same oil for your E46.Now u can look around for engine oil with the same 5w30 viscocity... then its the API SAE rating... the older generation oil is SH, SJ, SL and lately SM. Its alphabetical order. Then read the label carefully and look for MB229.3 or MB229.31 (for Mercedes <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin    :D" loading="lazy" data-shortname=":D" />) which has an equivalent of grade as BMW-LL01 or 04..Actually 5w40 can pakai too but make sure the MB229.3 or MB229.31 or BMW-LL01 or 04 must be on the label!</blockquote>