Can you use brake cleaner to clean a K&N air filter?
Never use contact/brake cleaner or carb cleaner on your K&N air filter, as they will severely damage its cotton gauze material.
Can you over oil a K&N filter?
Re-Oiling your K&N Filter Remember, DO NOT OVER-OIL the filter. You want just enough for it to wick evenly into the filter, giving it that pink K&N color. Spray Oil: Spray evenly across the filter surface like you would with spray paint.
Do K&N air filters go bad?
K&N Engineering has been manufacturing air filters for over 30 years. ... This system works for up to 50,000 miles, at which point the filter is cleaned, re-oiled, and ready for another 50,000 miles. These filters, by the way, are emissions legal in all 50 states and do not void the manufacturer's warranty.