K&N Air Filter Oil: Aerosol; Restore Engine Air Filter Performance and Efficiency, 99-0516, 347g(12.25 Oz)

Customers find the air filter oil works well with K&N filters and appreciate its quality and value for money. The product is easy to use, taking less than 5 minutes to apply, and sprays on evenly, with one customer noting it lasts for many cleanings. They value its effectiveness for reusable air filters, with one mentioning it's particularly good for diesel rigs.