Simon, what do you think of this? http://www.s2ki.com/s2000/topic/932071-oil-consumption/page__view__findpost__p__21451007
Keen on finding an oil that burns slower. It's not that I can't be bothered to top it up, I just don't want to kill the car.
Will also clean the PCV and give it a good service if there's any truth in what he's saying.
Try Magnatec 10W-40 A3/B4
PCV is worth checking. I think the 2004 had a modified PCV system too