I remember when I picked up my 8L S3 in Germany, I told the dealer I was planning on taking it easy. He said "why, these engines are bench run at the factory. Go out and enjoy the autobahns!". I later found out that he once used to work at the vw/audi engine factory. Anyway, I did take the opportunity to cruise at 140 for a bit on the autobahn, settling down to about 100. It was great.
Obviously, that is just one fellas statement, and no detail of how long the engines are run for. Plus, if the statement is true, who knows if they will do the same thing with the new S3 2.0TFSI?
Once back from Germany, I did try and treat the engine with some sympathy, not using full revs, but sometimes using high-ish revs. I think its important to use variable revs, not being stuck at the same revs all the time. But I have to say there were quite a few occasions where I gave the car some whelly.
The 1.8T engine itself was uprated on the 8L S3. Bit like how the 2.0TFSI has been uprated in the 8P S3. So strengthened components should also give you confidence, that the engine doesn't need to be treated too softly.
I think its more important these days to run-in all the other car components, sensors, hoses, brakes, tyres, gearbox etc. Letting them bed-in.
But who knows. Just try to follow what it says in the manual. I'm going to try, but it takes a lot of will power not to give it some whelly - in that sense I failed with my 8L S3.
AL