Possibly Ozbargains favourite oil is finally back under 50% off at Repco. Amazon have also price matched for those with prime membership.
https://www.amazon.com.au/Castrol-Edge-5W-30-Engine-Litre/dp…
Features
Transforms to be strongest when the pressure is highest, protecting your engine
Reduces power-robbing friction across engine speeds and conditions
Independently tested at the highest standards for proven performance
Recommended by world-leading car manufacturers
Protects the engine for the entire drain interval even under extreme pressure.
Castrol EDGE Synthetic 5W-30 Engine Oil 5L
Castrol EDGE 5W-30 engine oil A3/B4 with Fluid TITANIUM is the natural choice for drivers who demand maximum engine performance from today's modern vehicles requiring a high level of protection and higher performance oils. Today's engines continually push the boundaries of technology and engineering, they are smaller and ultra-efficient, without sacrificing performance. Advanced engines challenge the oil with increased pressures. These intense pressures cause friction, which can waste up to 10% of an engine's performance. Castrol EDGE 5W-30 A3/B4 is an advanced full synthetic engine oil suitable for use in automotive petrol and diesel vehicles, where the manufacturer recommends an ACEA A3/B4, API SL/CF or earlier specification 5W-30 engine oil.
Repco's RRP is now $91 for this oil though it can be found cheaper at other retailers when comparing RRP.
Looking for 5W-40