Description Reviews The K&N Recharger Filter Care Service Kit is a six step maintenance system designed to recharge your K&N Air Filter. It completely restores air flow efficiency so your air filter performs virtually like new! This kit will do several cleanings depending on filter size. K&N's Recharger Filter Care Service Kit Includes: 6.5 oz. (204 ml) Spray Oil 12-fl oz. (355 ml) Filter Cleaner K&N Filter Cleaning How-Too