All of our air filters are washable and reusable. They can be easily cleaned and oiled using our K&N Recharger kits and returned to your vehicle up to 25 times. We recommend you check your air filter every 30,000 miles, however, under most street conditions the filter will not require cleaning until 50,000 miles of continuous use. And yes, we’ve heard the stories of customers who ran their K&N filter for 100,000 miles without a cleaning, but we believe cleaning after 50,000 miles to be the most beneficial service life without sacrificing air flow.