The 2.2 20-valve turbo five (ABY) is mechanically related to the US-market AAN engine and is famously durable (300k+ miles with care). The catch is parts and small failures (window relay, intercooler, engine mounts): availability outside Europe means networking through S2/Audi forums and Facebook groups, and RS2-spec rear bumper/heckblende and Recaro seats are prized 'unobtanium' upgrades.
The robust ABY five — and the parts game
Audi S2 · mechanical