Not to try and scare you Digger, but is it possible your bike has done 102,500 miles? Being an '03 model it's entirely possible.
Other reasons for burning oil can be as simple as using the wrong kind of oil. When I had my Speed Triple, I tried a change of Motul semi synth, which burned at a rate similar to yours. I then tried the Silkolene full synth and it didn't burn at all. Nothing scientific, just seat of the pants stuff.
When I sold the S3 it had done 110,000kms and so long as you used Silkolene or Mobil it didn't burn oil more than about 500ml per change.
I also watched a friend with an S3 worry about his bike burning oil, or worrying that his dealer didn't top up the oil properly. In fact, the guy was checking it incorrectly, so make sure it's on level ground, with the dip stick screwed all the way in.
Mick
