My Germany is not so good, but it looks that this spec sheet from the Castrol Germany site may hold more info on the "elf and magic green formula";
http://129.35.64.91/bpglis/lubtds.nsf/technicaldata/129DB0C0535CFBC6C1256F63004E45F6?OpenDocument
This seems to be for our much loved GC 0w-30 by the approvals;
API SL/CF / ACEA A3/B3/B4 / Mercedes-Benz Betriebs- stoff - Vorschrift Blatt 229.3 / VW Normen 502 00 , 505 00 (Ausg. 1/97), 503 01 (Ausg. 09/99) für Audi S3 und TT (165 KW/225 PS), RS 4, W-Motore mit WIV / BMW Longlife-01
and the Kin. Viskosität bei 100°C of 12,1 valve
There are also formulations specifically for only VW and only BWM in the listing as well, possibly OEM fill or dealer service depart formulations?
http://129.35.64.91/bpglis/lubtds.nsf/technicaldata/129DB0C0535CFBC6C1256F63004E45F6?OpenDocument
This seems to be for our much loved GC 0w-30 by the approvals;
API SL/CF / ACEA A3/B3/B4 / Mercedes-Benz Betriebs- stoff - Vorschrift Blatt 229.3 / VW Normen 502 00 , 505 00 (Ausg. 1/97), 503 01 (Ausg. 09/99) für Audi S3 und TT (165 KW/225 PS), RS 4, W-Motore mit WIV / BMW Longlife-01
and the Kin. Viskosität bei 100°C of 12,1 valve
There are also formulations specifically for only VW and only BWM in the listing as well, possibly OEM fill or dealer service depart formulations?