Too lazy to search old posts, I am sure this question has already been asked and answered, but taking a chance anyway

:
- I guess leaving the air filter to be cleaned at 10,000 km service intervals is not a good idea?

If not, what interval is better?
- Can one clean the stock filter, or does it need to be replaced at the recommended interval? If it can just be cleaned, is is just a question of shaking it out, or does it need to be treated or washed somehow?
- Is there any use in going to a foam filter, and moving away from the stock filter?
Any advice would be much appreciated.