Not really sure why but over the space of 12k of ownership mine has had weird oil usage sometimes. The first time I had it serviced after buying it (not its overall first service though) I also went to stage 4, within 1000 miles the warning light was on for oil, I had a major panic, called and was told 1l in 1000 miles was actually acceptable. So I just kept it topped up. It didn't smoke or anything so assumed it was using it due to the extra performance.
I like to do oil services more often than the book says on modified cars so did an oil service in between main services, from there till next service it used hardly any which I was obviously far more pleased with but then confused why the previous oil usage was so bad.
The following service it was back to drinking oil again. Out of sheer curiosity I decided to do a full flush with oil and filter change after only 1.5k and it's back to not using any again. The in between oil only services where done at a different garage to where the main services were and are using millers nanotech oil. I'm not sure what oil my full services use, only recently had I noticed on their pricing structure that it's more expensive to use Mobil 1 oil, I've never been asked if I wanted that so I suppose it could be lesser quality oil getting used up quicker ?? Clutching at straws a bit there but if Mobil 1 is more expensive it suggests cheaper oil used as standard.
I have no real idea why this is. But I wonder if sometimes when it's serviced there's something happening (or not happening) causing it to use oil?
Anyway, reason for my post was to say if it's using oil it could be worth getting a decent oil and filter change to see if it makes any difference like it has on mine....