The 0w-30 will be to achieve the lower fuel consumption and co2 figures and to accomodate for the sub-zero temperatures in some countries.
Definitely go for a 5w-30 or a 10w-30 if you can one in the correct VW50x spec. Also would advise to half the manufacturers recommended service intervals if you want the car to last a long time (eg instead of a 15,000km interval, go for somewhere between 7,500-10,000km)
The brand new VAG cars are 0w-20 in the VW508/509 spec.
Some new Japanese cars use 0w-16 or 0w-8 oil which is insane.
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