Sierra Marine 18-9400-2 Premium Blend 4-Stroke Marine Engine Oil – 25W-40 FC-W Certified (1 Quart)

Sierra Premium 25W-40 4-Stroke Marine Stern Drive/Inboard Engine Oil is specifically engineered to exceed the demands of today’s high-horsepower marine engines and withstand the harshest saltwater environments. Formulated for sterndrive and inboard applications, this NMMA FC-W certified oil delivers superior lubrication, wear protection, and corrosion resistance compared to standard automotive oils.

Key Features & Benefits

• NMMA FC-W Certified – meets or exceeds the latest 4-stroke marine engine requirements
• Outstanding lubrication and corrosion protection, even during extended storage periods
• High detergency keeps pistons cleaner and prevents ring sticking
• Advanced anti-wear additives and antioxidants reduce internal engine wear under high-load conditions
• Excellent low-temperature flow for easier cold starts and immediate protection
• Outperforms ordinary 4-cycle automotive oils in marine conditions
• Backed by Sierra’s 50+ years as the marine industry’s leading aftermarket supplier

Specifications

• Viscosity: SAE 25W-40
• Type: Premium Blend (semi-synthetic)
• Volume: 1 U.S. Quart (0.946 L)
• API Rating: Meets FC-W requirements
• Sold as single quart bottles

Perfect for Mercury, MerCruiser, Volvo Penta, OMC, Yamaha, Honda, and most other 4-stroke sterndrive and inboard gasoline engines calling for 25W-40 FC-W oil.

(No manufacturer warranty – see Sierra’s standard terms)