Lucas Synthetic 4-Stroke Outboard SAE 10W-40 Engine Oil is designed to improve wear protection and increase catalyst life in newer outboards using catalytic converters. Meets or exceeds NMMA FC-W (CAT) performance. Meets JASO MA performance for air cooled motorcycles and all-terrain vehicles. Can be used in automotive applications where API SM oils are called out for. Also has applications in inboards and 4-stroke personal watercraft. Lucas Synthetic 4-Stroke Outboard SAE 10W-40 Engine Oil is fortified with special synthetic additives that coat all moving parts to guard against rust and moisture during long storage periods.