Description
The Sierra 18-9400-4 25W-40 FC-W 4-Stroke Marine Stern Drive Oil is engineered to deliver dependable lubrication and corrosion protection for stern drive and inboard engines operating under high load and demanding marine conditions. Formulated specifically for marine environments, it outperforms standard automotive 4-cycle oils by providing enhanced detergency, oxidation resistance, anti-wear protection, and corrosion control. This oil helps reduce internal engine wear while protecting critical components from rust and corrosion, supporting cleaner pistons and helping prevent ring sticking. It also maintains excellent low-temperature performance for reliable operation across varying conditions. Meeting or exceeding API SJ, CF-4, and CH-4 standards and carrying NMMA FC-W certification, it is recommended for use in Mercruiser and OMC applications.
Features
- Formulated for stern drive and inboard engines operating under high load conditions
- Provides excellent lubrication, detergency, and corrosion protection
- Helps reduce internal wear while protecting against rust and corrosion
- Supports cleaner pistons and helps prevent ring sticking
- NMMA FC-W certified and meets or exceeds API SJ, CF-4, and CH-4 standards
- Protection of internal parts from corrosion
- Cleaner pistons and prevention of ring sticking
- Excellent low temperature operating properties
- Meets or exceeds quality performance API SJ, CF-4, and CH-4
- NMMA FC-W Certified
- Recommended for use in Mercruiser and OMC
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