Antonye, thanks for the link.
I surfed off to here ==>
http://www.ducati.com/my2002/ducatiM...modelName=998S which does indeed state the 2002 998S has the 2001 996R engine with a deep sump. It doesn't actually say the 998 doesn't have a deep sump though and since I've not seen a picture of the two I don't know what the real difference is (10mm/20mm/50mm deeper ??).
Seems the forks & rear shock are the same as the standard 998 though, only the steering damper is different (S has ohlins one).
So potentially the sump could be different, but what else engine wise ?
The info states the bore & stroke are the same.
Cheers,
John.