Audi S3 8P is a good car and the engines tend to be bulletproof as long as they are looked after. I will be selling mine soon as a I have a scratch to itch but I think I will come to regret it. By the time my car is up for sale it will have had all of the below done. Not everything on this list needs to be done but if I was looking for a S3 8P I would be checking it has had the majority of these parts changed recently as they contribute towards the vehicles performance and driveability. This is what I have done within the past 6 months. No doubt others will be along to add to the list.
Brake pads and disc all round
4 x Spark plugs
4 x Fuel injectors (not necessarily needed)
4 x Coil Packs
High pressure fuel pump (not necessarily needed)
Racing break fluid (every 45k or 3 years I think)
S-Tronic oil and filter (at correct mileage interval)
Air filter, oil filter, pollen filter etc
Diverter Valve
Cam follower
PCV Valve
Cambelt and water pump (at correct mileage/yearly interval)
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