Technically, compared to 5W-30 oils, a 0W-30 oil will flow quicker on start up and yet provide the same protection when at operating temperatures. But the viscosity rating of an oil is by no means an indicator of performance.
My opinion on oils:
The Australian-market Edge Sport 5W-30 will meet the minimum requirements for your engine. I personally wouldn't use it, but will meet warranty requirements.
Two better performing oils are Castrol Syntec 0W-30, available at PerformanceLub.com. Seems like a good place to buy, see this thread. Also known as "GC" (German Castrol) by the people at Bob Is The Oil Guy forums. Has a loyal following and rave about its performance.
The other great oil is Castrol SLX Professional Longlife III Powerflow 5W-30 which meets the latest VW spec 504.00/507.00. Should be available from the dealer but probably better off buying from a Castrol distributor because of dealer markup.
The Australian website doesn't show a 0W-30 oil in the "Edge Sport" range. Perhaps you are confused with the Euro-market "Castrol Edge 0W-30" - which would also be an excellent choice if you can get it.
All in all, I'd get the Syntec 0W-30. Mainly because its performance has been verified by the BITOG forum, is excellent value for money at $14.00 per quart ($14.80 per litre) and easy to obtain if bought from PL.
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