As mentioned earlier, I had my FG serviced this week. The car has always run with Castrol Edge 5W-30 A3/B4. I once had a mechanic tell me to pick and oil and stick with it, so I have.
I've always supplied my own oil for this car. I needed to grab another bottle have to enough to go with 6 Lt I bought earlier this year when it was on sale. Looked up who had it cheapest and landed at Supercheap, only to find they don't have Edge Titanium 5W-30 in 5 Lt jugs, but had a store full of the what they call Edge Hyspec 5W-30 A3/B4.
https://www.castrol.com/en_au/austra...gine-oils.html
https://automotivesuperstore.com.au/...SABEgItPfD_BwE
Of course, the Supercheap website doesn't list this product at all, I probably wouldn't have gone there if it was.
https://www.supercheapauto.com.au/br...castrol%20edge
I ended up buying a 1 litre bottle of the old Edge Titanium at a premium just so I didn't end up mixing different oils. The question I have though, are these two different oils, or just a rebrand to latch onto the greenies in their hybrids? The A3/B4 prefix remains.