Quicksilver 25W-40 4-Stroke Synthetic Blend Oil is engineered for use in all brands of 4-stroke outboard, stern drive, and inboard engines. Compatible with FC-W and FC-W Catalyst standards, it delivers superior wear, shear, and corrosion protection. This oil maintains optimal performance under high temperatures and extended maximum output, ensuring enhanced shear protection and engine longevity. Ideal for demanding marine environments, it supports reliable operation and durability.