HPI Air Filter Oil, Spray Type New from HPI Racing is a 4oz spray can of our specially blended Air Filter Oil. Keeping your air filter clean and oiled is essential for maximum engine protection and long engine life and now it's easier than ever. The convenient 4oz spray can is perfect for pit boxes and features a precision nozzle for easy application of the oil. The blue color makes it easy to see the oil dispersion on white foam elements. Keep a can on hand for a quick and easy way to re-oil your air cleaner.