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Good question. The "Technical training. Product information. W20 Engine" (©2013 BMW AG, Munich) document has this to say about that:

I think that means that the 'nominal' octane rating is 95 RON and it should work on anything from 87 to 98 RON.

https://en.wikipedia.org/wiki/Octane_rating

US and Canadian pumps show the "AKI" (Anti-Knock Index) which is the average of RON (Research Octane Number) and MON (Motor Octane Number). Often it is labeled as "(R+M)/2".

In Germany, 95 RON gas ("Aral Super 95") has a MON of 85 and therefore an AKI of 90. Same for "EuroSuper" or "EuroPremium" or "Regular unleaded" in Europe, "SP95" in France, and "Super 95" in Belgium. It looks like an AKI of 90 would be a close approximation of the 95 RON gas used in Germany and the rest of Europe. This is in the range that the US calls "Midgrade":

US 'Regular' (87 AKI) is 91-92 RON
US 'Midgrade' (88 to 90 AKI) is 94-95 RON.
US 'Premium' (91 to 93 AKI) is 96-98 RON.

<blockquote data-quote="JohnWasser" data-source="post: 64371" data-attributes="member: 7035">Good question.&nbsp; The &quot;Technical training. Product information. W20 Engine&quot; (©2013 BMW AG, Munich) document has this to say about that:I think that means that the &#039;nominal&#039; octane rating is 95 RON and it should work on anything from 87 to 98 RON.https://en.wikipedia.org/wiki/Octane_ratingUS and Canadian pumps show the &quot;AKI&quot; (Anti-Knock Index) which is the average of RON (Research Octane Number) and MON (Motor Octane Number).&nbsp; Often it is labeled as &quot;(R+M)/2&quot;. In Germany, 95 RON gas (&quot;Aral Super 95&quot;) has a MON of 85 and therefore an AKI of 90.&nbsp; Same for &quot;EuroSuper&quot; or &quot;EuroPremium&quot; or &quot;Regular unleaded&quot; in Europe, &quot;SP95&quot; in France, and &quot;Super 95&quot; in Belgium. It looks like an AKI of 90 would be a close approximation of the 95 RON gas used in Germany and the rest of Europe.&nbsp; This is in the range that the US calls &quot;Midgrade&quot;:US &#039;Regular&#039; (87 AKI) is 91-92 RONUS &#039;Midgrade&#039; (88 to 90 AKI) is 94-95 RON.US &#039;Premium&#039; (91 to 93 AKI) is 96-98 RON.</blockquote>

[QUOTE="JohnWasser, post: 64371, member: 7035"] Good question. The "Technical training. Product information. W20 Engine" (©2013 BMW AG, Munich) document has this to say about that: I think that means that the 'nominal' octane rating is 95 RON and it should work on anything from 87 to 98 RON. https://en.wikipedia.org/wiki/Octane_rating US and Canadian pumps show the "AKI" (Anti-Knock Index) which is the average of RON (Research Octane Number) and MON (Motor Octane Number). Often it is labeled as "(R+M)/2". In Germany, 95 RON gas ("Aral Super 95") has a MON of 85 and therefore an AKI of 90. Same for "EuroSuper" or "EuroPremium" or "Regular unleaded" in Europe, "SP95" in France, and "Super 95" in Belgium. It looks like an AKI of 90 would be a close approximation of the 95 RON gas used in Germany and the rest of Europe. This is in the range that the US calls "Midgrade": US 'Regular' (87 AKI) is 91-92 RON US 'Midgrade' (88 to 90 AKI) is 94-95 RON. US 'Premium' (91 to 93 AKI) is 96-98 RON. [/QUOTE]

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