Interesting statements there, the VAG 1.8T engine is well regarded to sound like a bag of spanners on start up, certainly all of the 1.8T cars I've been in don't sound great when cold.
I've also been advised against getting oil that's too thin when cold by a number of tuning companies.
I'm pretty sure the S3 doesn't warn about oil level, it warns about oil pressure, if that happens your engine will not be happy. Too many people on here don't seem to be checking the oil level in their cars, it's a high performance engine and worse it's got a turbo, you should really check the oil every tank or two of petrol especially if you drive hard as they will burn oil, if you use high engine speeds and loads it should be pretty close to the max mark the whole time.
If you want good quality oil at cheap prices go to opieoils and get on of the ester based oils in the motul or silkolene ranges that meets the correct S3 spec (and get a discount at the same time).
I'm pretty sure the Quantum Synta Gold old that most Audi / VW dealers use is an Esso (ExxonMobil) product.