I changed the oil when I purchased the vehicle but found I needed to top up the oil after only 3K KM, the stick showed halfway yet there appeared to be no leaks.
After a search online, I found an article that describes how a PCV can cause oil loss if it is not operating correctly.
On inspection, the PCV was clogged shut and there was evidence of oil vapours being passed around the grommet leaving an oily film around the area.
I washed the valve with carb cleaner and replaced it, this until I get a new one. I guess I need to check the throttle body for gunk?
After a couple of weeks of owning the car I was not very impressed with it's performance, there was a noticeable flat spot on the accelerator pedal but since cleaning, something so simple as the pcv, the flat spot has gone and the performance is most satisfactory. I just need to keep my eye on oil consumption.
Here is an interesting link.
http://www.tegger.com/hondafaq/pcv-replace/index.html
I have searched this forum and have found little in the way of discussion on the subject of the pcv?
Regards