Lucas Stern Drive Inboard Engine Oil SAE 25W-40 is designed to improve wear protection and increase catalyst life in newer inboards using catalytic converters. Meets or exceeds NMMA FC-W (CAT) performance. Can be used in automotive applications where API SM oils are called out for. Also has applications in 4-stroke outboards and 4-stroke personal watercraft. Lucas Stern Drive Inboard Engine Oil SAE 25W-40 is 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 stern drive and inboard marine performance requirements.