Gordon,
Not sure if this helps but in the UK I have a top up bottle of Mobil 1 ESP Formula (Emission System Protection) Fully Synthetic 5W-30 which was dealer supplied when I got the car new last September. Specifically states on rear label 'Approved for VW'.
UK handbook states the following:
With Longlife Service - High-lubricity multigrade oil VW 504 00, VW 503 00
Without longlife Service - High-lubricity multigrade oil VW 501 01, VW 502 00, VW 504 00
Obviously in your (much) hotter climate, a different viscosity and/or temperature range may apply, but VW 504 00 and VW 501 01 are the same as UK specification - Mobil and Castrol are both proprietary brands and would no doubt do the job very well.
How's the weather down there - i'll be visiting next month for a holiday - doing the Melbourne F1 GP and a whole bunch of other things
Cass