5 Quart Outboard Engine Oil Synthetic SAE 10W-40Lucas Oil. Formulated especially for the harsh conditions of high speedwatercrafts. These outboard engine oils are catalyst compatible and designed for 4-Stroke applications but also work well in Inboards and Personal Water Crafts. Long lasting and safely blends with synthetic & non-synthetic oils, Fortified with a special blend of synthetic additives that coat all moving parts to guard against rust and moisture during long periods of storage. Features include: excellent for use with supercharged, turbo charged or nitrous oxide high performanceengines Protects against rust and moisture during long periods of storage Safely blends and is compatible with synthetic and non-synthetic oils. Provides rust and corrosion protection in both fresh water and salt water environments.