Castrol Magnatec Stop Start Engine Oil 5W-30 A5 6 Litre
Good price for synthetic oil. $44 for 6 litres = $29.30 for 4 litres.
Limit 2 per customer.
It might be worth buying 2 if your car takes 4 litres.
It a good oil, I used it in one of my cars and you always need a bit more for top-ups.