Motorex Formula 4T Oil - 15W50 - 4L. 171-455-400 Synthetic-blend, high-performance 4-stroke engine oil for motorcycles Provides temperature stability and absolute lubrication reliability The oil of choice for all the new 4-stroke motocross machines with protection to spare Offroad racing legend Larry Roeseler recommends Motorex Formula 4T for the street or the racetrack Temperature stable formula