Let me start by saying these are not Ozbargains "cheapest/favourite oils"
For those that are after extremely high quality grade oils save for shopping for Amsoil/Redline/Motul products - These are your best bet.
Mobil 1 0w40 - $80.50 (rrp $115) Reward Gateway members @ 15% = $68
Mobil 1 5w50 - $79 (rrp $114) Reward gateway members @ 15% = $67.15
These oils both have extremely high quality base stocks and additive packages with Porsche A40 approvals. Consult your owners manual for correct viscosity ranges - For those who are users of 'Ozb's favourite oil' (Edge 5w30) - I would be confident in saying that your vehicle should accept the 0w40 grade (i read it is on the 'thinner' side of the 40 grade).
Enjoy.
Even discounted, Mobil 1 has always been massively overpriced in Australia
Petronas Syntium 7000 0W-40 which is also Porsche A40 approved
was $58