Handmade in the USA using only the finest materials, K&N OE Replacement Air Filters are washable and reusable. Regardless of what you've heard, its almost impossible to wash your K&N Air Filter too much. Inside K&N's testing laboratory, they have washed and re-oiled one K&N's Air Filter more than 100 times and it still performs up to specification. Depending on your driving conditions, we recommend cleaning your filter every 50,000 miles. To clean and re-oil, purchase K&N's filter Recharger maintenance kit and follow the easy instuctions.