TBH just get any full syn oil when on sale. The Aurion isn't going to notice a difference really as I have used Mobil1, Castrol Edge, Shell Ultra and Penrite HPR5 and they all perform similar. I've stuck with Penrite only because it comes in a 6L bottle which is very convenient when it comes to changing out the oil.
http://www.supercheapauto.com.au/Product/Penrite-HPR-5-Engine-Oil-5W-40-6-Litre/518961