That isn't a pretty thing

It means oil got into combustion chamber, resulting in burning oil (symptom: blue smoke, and smell like an oil).

Maybe you are in early stage of worn cylinders. I don't think you can do much about it now, but you can try W20-50 oil (high mileage oil) to reduce the seepage.

I have seen couple occasions that japanese engines started to fail after 100kmi... I have not been convinced that Jap's cars last long...