Royal Purple 11629 HPM FC-W Multi-Vis 10W-40 High Performance Synthetic Marine 4-Stroke Motor Oil - 1 qt. Exceptionally high film strength for dramatic reductions in engine wear and reduced heat engine to extend the life of your engine Improved sealing between the piston ring and cylinder wall for optimized fuel economy and maximum horsepower and torque Exceptional oxidation stability extends oil life and allows for more hours between oil changes saving you time, money and reducing the impact on the environment Advanced synthetic solvency reduces engine deposits and keeps engines clean