The True Flow Foam Air Filter Cleaning Kit was created to ensure your foam filter is performing at its optimum level. While protecting and enhancing your engine's performance, the True Flow air filter traps loads of dust, dirt and debris in its tiny cells. Somewhere between 30,000 and 50,000 miles, under normal driving conditions, you'll notice the True Flow words are no longer visible on your filter. This means it's time for a cleaning. Spray-on application makes the 14.5 oz Foam Filter Cleaner and 5.5 oz Foam Filter Oil fast and easy to use. The True Flow Foam Air Filter Kit will yield roughly 3 thorough cleanings or about 150,000 miles of top-performance filtration. Keep the clean air flowing and your engine going with the True Flow Cleaning Kit.