Cheap engine oil. Buy 2 or more for $20 each. 53% off RRP$42.99.
Gulf Western Premium Gold 15W-40 Engine Oil 5L: 2 for $40 + Delivery ($0 C&C/in-Store) @ Supercheap Auto

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Old cars can use 15w 40
Including plenty of Holden's
Thanks oh i think i remember like high mileage engines
Thanks OP, bought 3 for my old Toyota.
Many Toyota models before 2010 can use 15W-40 and even 20W-50.
This 'Premium Gold' is semi-synthetic oil
Just a word of caution for those wanting to use these on wet clutches eg motorcycles.
Even though the description says “ PREMIUM GOLD is suitable for four stroke motorcycles fitted with wet clutches and stationary engines.” I found the clutch on my motorcycle slipping a fair bit after switching to this oil.
Switched back to a proper JASO MA spec oil immediately and felt the difference.
I used Syn X5000 on my Z1000 , so far no issues. I stick to recommend ones
What car uses 15w40
I usually see 10w30
10w40