Well as far as I can tell, N3 is simply NOT available here in Australia. When I was about to begin the belt replacement, I went to my local BMW dealer, and there were a couple of blokes standing at the door to the workshop (customers of course are not allowed to go inside that sacred area!). I got chatting to these two and asked them what grease they used on the variator splined shaft, told them I had the job ahead of me but I needed some of that grease. Within a minute, one of them produced a handful of the grease they use! I still don't know what the grease is, but I still have enough left over to do about 10 belt replacements! Cost: nothing. It is the first time any BMW dealer has given me what I needed without charging at least $50!