Pre-lube your new engine and eliminate dry starts and initial wear on engine components. Using normal engine oil to fill the tank, the tank is then attached to the engine by the supplied hose and adapters. The tank is then pressurized using your air compressor, the fill vale is turned and in a very short period of time oil will be flowing throughout your engine. The prime is complete. Top the engine off with oil and now you can start an engine that will live for a long time.