PN#10654  SKU#15843  Extreme Duty Marine, Semi-Synthetic, SAE 20W-50, 1 Quart. Excellent for use with supercharged, turbo charged or nitrous oxide high performance engines. Protects against rust and moisture during long periods of storage. Safely blends and is compatible with synthetic and non-synthetic oils. Dropping point 540 lbs. Provides rust and corrosion protection in both fresh water and salt water environments. Effective Water Resistance. Long Lasting. Resist Extreme Pressure. Extreme Friction Reducer.