Torco's Foam Filter Oil (FFO) is formulated with special base oils and tackifier additives to prevent moisture and abrasive elements from passing through foam filters and entering the engine. FFO is easy to apply and will not dry out, drip or run. FFO will not gum up or clog foam passages. Suitable for all foam filters and aftermarket filters that require oiling. Maximizes airflow. Waterproof formula. Easy to apply. Easy to clean. For all filter elements requiring oiling. 13 ounces.