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Ok another update:
I spoke to Watson Holden down in VIC, spoke to an excellent guy Tom, he explained to me that Holdens acceptable oil usage for a series 2 SV6 3.6 SIDI is 2.5ltrs /10000ks.
I will keep updating as I investigate further.
Holden covers warranty items, not the dealership. That being said I would demand they use the oil that Holden recommends, not the dealer. If it uses excessive oil on the recommended oil then you have a case.
The exceptional amount is a bit ridiculous but thats how it is unfortunately. We have replaced engines that go beyond the acceptable limit under warranty but theres a lot of other things to try before it gets to that stage.
What brand of oil does Holden use.
What does Holden actually state the sidi should use and what does your local dealership recommend?
Off to one today for the first free 3000k service... Aka look up. Tempted to buy a filter and oil and change it over afterwards