Air Filter Care
Here at PDQ we would recommend that you clean and re-oil your K&N air filter every 10,000-15,000 miles. In very dirty/dusty conditions you may need to refresh your air filter more often.
K&N have a range of specific cleaning products to ensure your filter is kept in the best possible condition...
Instructions on how to clean and re-oil your K&N can be found here: http://www.knfilters.com/cleaning.htm