Castrol Super Outboard Motor Oil is engineered for performance. Its premium two-stroke cycle formula provides maximum engine protection. Today’s outboards burn unleaded fuels that may vary in quality, limiting the performance and life of your engine. Castrol’s TC-W3 formulation offers improved protection against piston deposits and ring sticking over a wide range of fuel quality. Certified by NMMA for use in all water cooled 2-cycle outboard engines and personal water craft, such as jet skis, where TC-W, TC-WII, or TC-W3 oils are recommended.