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Message: <blockquote data-quote="Schwepps" data-source="post: 362434" data-attributes="member: 3592">'Synthetically modified mineral oil' means hydrocracked mineral oil - G-III. The supporters of classifying G-III as synthetic argued that further refining mineral oil in a cracking process in the presense of hydrogen, could be considered a synthesizing process. The judge unfortunately concurred, although there were lots of sound arguments against it, including from a Nobel prize winning chemist.So Q8 Formula Special is a G-III and Q8 F1 is a semi-synthetic - G-IV and G-III typically in a 30-70 mix, but there is no defined formula. There are some 'semi-synthetics' which are 100% G-III, but as the additives are synthesized hydrocarbons, the blender calls it a semi. PAO is very expensive, so all this is done to maximise profit.I'm guessing, but BMW Special Oil is probably below LL98, LL01 and LL04. It would be great if you can find the BMW spec details for all these and post them. Also great if you can find the latest list of BMW approved oils, for that will show the oils which are truly G-IV and BMW tested, not those which just slap on a LL-xx compliance on the label.</blockquote>