Sierra 10W-30 4-Stroke Conventional Catalyst Marine OilSierra 10W-30 4 Stroke Catalyst Engine oil is designed for modern 4-stroke recreational engines with or without emission catalyst systems. Approved for all 4 stroke applications including outboard, inboard, and sterndrive. Exceeds all requirements including FC-W and FC-W Cat compatible. The premium blend provides superior protection against corrosion in harsh marine environments. Anti-wear technology prevents phosphorus depletion to extend the mission catyalyst life while still providing outstanding protection.Features: ZDDP Anti-wear additive; Deposit control; Exceeds 4 Stroke FC-W and FC-W Cat compatible requirements; Approved for 4 Stroke outboard, inboard, and sterndrive applications; Replaces: Mercury. Johnson/Evinrude, Nissan/Tohatsu, Suzuki, Yamaha, & Honda; How much oil does my engine need?It varies model to model, check out our Engine Oil Capacity Guide for more information and capacity charts!// Sizing: Quart 18-9420CAT-1; Gallon 18-9420CAT-3; Interchange Mercury Marine; 92-8M0078625; 92-8M0078626;