A Mishimoto Air Filter Re-Oil and Cleaning Kit allows you to reuse a Mishimoto Oiled Cotton Air filter, keeping the filter at peak performance.Reuse your Mishimoto Air FilterKeep filter working properlyProtect you engineOne of the big advantages of an oiled cotton air filter is that it can be cleaned and reused. When you clean it, it's important to reapply the oil as this is an essential part of the filtration system.The oil helps catch and retain the smallest particles of dirt, essentially forming an extra layer of filtration.By doing this, you can make the filter element from a Mishimoto intake system perform perform as good as new.Reoiling your air filter protects your engine and saves you money.