Looking at approved used Audi S3s at the moment. Lots of them seem very high mileage. Should I be worried about buying a 2001 S3 with 60k miles on it for example? I suppose it may be too early to tell as the S3 has only been around a few years, but hasn't that same 1.8 engine been used in other cars before that? So is it a case of bye-bye engine after 100k miles or keep on rollin till 200k??