so, this is what my SA said about doing the 6MT change at every 3rd oil change, keep in mind, I'm on the low-mileage plan:
A "full engine oil service" is what we perform when the vehicle shows due for Engine Oil in the CBS data (Vehicle Service Menu). It is a conditioned based service based on how the vehicle is driven. If you do not go through the amount of miles needed to reach a full oil service in a year then BMW will pay for a "low-mileage annual oil service" but your count down in the CBS data does not get reset. It is only reset when the full engine oil service is performed. So based on the SIB the transmission fluid is only changed at the 3rd Engine Oil Service, low mileage annual oil changes do not count as full engine oil services. The next time your vehicle is due for Engine Oil in your vehicle service menu is when you will be due to perform the 1,200 mile break in service again. .