Autobarn have Shell Helix Multigrade 20W-50 4 litre pack at $9.99 (save $12.00). Yes this isn't as good as their previous sales as this is only a 4 litre pack instead of a 5 litre pack but still better than paying full price if your after this type of oil for older cars.
This oil has been upgraded from API SG to API SJ rating. (now the same rating as Valvoline XLD Premium and Castrol GTX Original)
A mineral based motor oil recommended for naturally aspirated passenger cars fuelled by either petrol or LPG and lightly loaded diesel engines. It is particularly suitable for protecting older car engines.