2018-05-14. Changing of the drive chain set is presently prescribed at 12,000 mi. in the maintenance schedule for BMW Service for the K02 and K03 models. A change at this stage may not be required. Thus the maintenance work "Changing the chain set" will be replaced by the maintenance work "Checking and lubricating the chain drive" as in the case of other models with chain drive. NHTSA's copy of the document (PDF)
Bulletins from the manufacturer that mention a maintenance schedule or a service interval, as NHTSA summarises them. They are not the schedule itself: read the document, and the owner's manual.
Position 8 of a VIN names the engine on many vehicles: how to read a VIN. Safety equipment depends on the trim, so decode a VIN to see what one vehicle has.