Sierra 18-9551-2 10W-40 FC-W 4-Cycle Outboard Synthetic Blend Oil, Quart

Sierra 18-9551-2 is a premium 10W-40 synthetic blend motor oil specifically formulated for marine 4-cycle outboard and inboard engines. This high-performance oil meets NMMA FC-W and API SL specifications, ensuring optimal protection for marine engines operating without catalytic converters.

Key Features:

• NMMA FC-W certified and API SL rated for superior marine engine protection
• 10W-40 viscosity grade provides excellent performance across varying temperatures
• Synthetic blend formula delivers enhanced lubrication and engine cleanliness
• Advanced corrosion inhibitors protect against saltwater and freshwater damage
• Superior rust protection designed specifically for harsh marine environments
• Compatible with all 4-cycle outboard and inboard gasoline engines without catalytic converters

This quart-size container provides convenient oil changes for single or multiple engines. The synthetic blend formulation offers better oxidation stability and thermal protection than conventional oils, helping extend engine life and maintain peak performance in demanding marine conditions.