Valvoline Super Diesel 15W-40 10L for $42.00 (Normally $104.99) + Delivery ($0 C&C from Limited Stores) @ Autobarn

Extremely cheap diesel engine oil, down to $4.30/Liter. Stock is limited, but Supercheap are happy to pricematch and took them down to $41/drum for me.

The item description is wrong as it states the oil is 20W50, but the actual product is 15W40 if you check the item code (1079.1)