Just an update on this…
I contacted Castrol tech and they have confirmed this is a correct oil for the ute. Below is their response….
Magnatec Professional 10w-30 is recommended for your vehicle. Please see the list of trade oils below that are recommended.
When your car was new, Magnatec Professional 10w-30 would have been most popular, used throughout Holden dealerships in Australia
From 2011, GM introduced more precise engine oil specifications for their engines – GM dexos1 5w-30 for petrol. These oils were backwards compatible for petrol engines that previously used 10w-30, so they became most popular for dealerships. Magnatec Professional 10w-30 remained an option for vehicles built prior to 2011.