Lucas Sterndrive Inboard Engine Oil SAE 25W-40 is designed to improve wear protection and increase catalyst life in newer inboards using catalytic converters. For 4-stroke outboard and PWC applications, plus automotive applications where API SM oils are required. Fortified with special synthetic additives that coat all moving parts to guard against rust, corrosion, and moisture during long storage periods. Meets or exceeds Mercruiser sterndrive and inboard marine performance requirements. Meets or exceeds NMMA FC-W (CAT) performance.