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Message: <blockquote data-quote="astroboy" data-source="post: 344877" data-attributes="member: 4527">Maybe that's what the American blender refer to as "Cross Blend" for their 100% Synthetics, as Schwepps mentioned mixing Group 3(mineral) and Group 4(chemical), which is Semi Synthetic by European standard.Group 1 to 3 are all mineral based while Group 4 & 5 are chemical based.If not mistaken, Castrol Magnatec has 5W-30 Semi-Sync.I am running Torco 5W-30 100% Synthetic BMW-LL04 for my E90, very smooth ma.. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite7" alt=":p" title="Stick Out Tongue    :p" loading="lazy" data-shortname=":p" /> Aiyaa, just make sure I drain them no more than 10k km loo... not cheap also.. more than RM200 for 4L <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite3" alt=":(" title="Frown    :(" loading="lazy" data-shortname=":(" /></blockquote>