Do you have service manual? Factory filter should be washed yearly and re-oiled. It will easily last 40-50k miles. Although it will wear more with age than miles. If yours is crumbling from lack of oil, get one of these.
https://www.ebay.com/itm/High-Flow-A...-/122797732844
I got one of those for my race bike and use K&N filter oil from spray can.