VW SPEC 504.00/507.00 is long life oil, it's designed to run extended service intervals up to 2 years and 20,000 miles.
Just because an oil does not meet 504.00/507.00 does not mean that it's not as good (or better) for your engine, it's just not up to the extended long life service intervals.
If you want to run up to 2 years and 20,000 miles between services then on yourself, most tuners & oil experts would tell you that long life servicing is not a good thing for a performance engine, ok maybe for a pure motorway cruncher but not a 300+ bhp performance engine regularly driven hard and running increased oil temperatures.
If you look on the Fuchs oil finder you will see that 5w40 is a recommended grade oil too, it offers more protection at increased running temps over 5w30, both offer the same cold start protection.
It's just my opinion but I stand by what I say, a tuned S3 producing upwards of 100+ bhp over standard, driven hard and regularly taken to redline will see far increased oil temps over standard, I'd suggest you really want to be picking more suitable oil and change it more regularly, the Millers and Fuchs Ester Synthetic Motorsport range being some of the best available.
It's not even like it's expensive, £50 twice a year for the life blood of your engine?
But hey, it's your car guys.....