I live in Panama (the country) but own a 2007 US spec z4m coupe and the dealer insisted me on getting the part No. 83229405462 (MSP/A) instead of the part No. 83222282583 (SAF-XJ) thats the one discussed all over this and other z4m forums for my diff.
Could someone shed some light on this?
They even emailed me the list from their computer showing the "correct" diff oil to use.