Sierra 25W-40 FC-W Stern Drive Oil - Available in Quart and 5 Quart
Sierra 25W-40 FC-W Stern Drive Oil - Available in Quart and 5 Quart
Sierra 25W-40 FC-W 4-Stroke Stern Drive Oil is a marine-specific engine oil developed for the high load and running stresses that stern drive and inboard engines experience on the water. Standard automotive 4-cycle oils are formulated for a very different duty cycle, so Sierra built this oil specifically for the marine environment, where it outperforms typical automotive oils in protecting hard-working stern drive and inboard powerheads.
The 25W-40 blend offers strong detergency, anti-oxidants, and anti-wear additives, along with corrosion protection that helps guard internal engine components during storage and use in a marine environment. It also delivers excellent low-temperature operating properties for reliable startup and circulation in cooler conditions. The oil is NMMA FC-W Certified and meets or exceeds API SJ, CF-4, and CH-4 performance standards, and is recommended for use in Mercruiser and OMC stern drive and inboard engines.
This oil is sold as a product line available in two container sizes so you can buy the right quantity for a single oil change or stock up for multiple services.
Specifications
- Brand: Sierra
- Manufacturer Part Number: 18-9400
- Product Type: Stern Drive Motor Oil
- Viscosity: 25W-40
- Certification: NMMA FC-W Certified; meets or exceeds API SJ, CF-4, CH-4
- Recommended Use: Mercruiser and OMC stern drive and inboard engines
- Container Type: Bottle
- Vehicle Service Type: Boat
- Available Sizes: Quart (32 Fluid Ounces), 5 Quart (160 Fluid Ounces)
- OEM Equivalent Part Number: MERCURY MARINE 92-857389A1
- Country of Manufacture: Made in the USA
Sizes & Options
Choose the Quart size for a single top-off or partial oil change, or the 5 Quart size if your engine's sump capacity requires more volume or you want to keep extra oil on hand for future changes. Both sizes contain the identical 25W-40 FC-W formulation; only the container volume differs.
Frequently Asked Questions
What viscosity is Sierra 25W-40 FC-W Stern Drive Oil? It is a 25W-40 viscosity blend, formulated specifically for marine stern drive and inboard engines rather than automotive use.
Is this oil certified for marine engines? Yes, Sierra 18-9400 is NMMA FC-W Certified and meets or exceeds API SJ, CF-4, and CH-4 performance standards.
Which engines is Sierra 18-9400 recommended for? It is recommended for use in Mercruiser and OMC stern drive and inboard engines.
What sizes does this oil come in? Sierra 25W-40 FC-W Stern Drive Oil is available in a Quart (32 fluid ounces) bottle and a 5 Quart (160 fluid ounces) container, both part of the 18-9400 line.
How do I know which size to order? Order the Quart size for a single top-off or a partial oil change, and the 5 Quart size if your engine's oil change requires a larger volume or you want extra on hand; both sizes are the same 25W-40 FC-W formula.
Is there an OEM equivalent part number for this oil? Yes, Sierra 18-9400 25W-40 FC-W oil has an OEM equivalent part number of MERCURY MARINE 92-857389A1.
Can this oil be used in automotive engines instead of a standard 4-cycle automotive oil? This oil is developed for the marine environment and stern drive/inboard duty cycles; it is intended to outperform standard 4-cycle automotive oils in that application rather than serve as a substitute for automotive-specified oils.
Does Sierra 25W-40 FC-W oil provide corrosion protection? Yes, the formulation includes corrosion protection additives along with detergency and anti-wear properties to protect internal engine components.
How does this oil perform in cold conditions? Sierra 18-9400 25W-40 FC-W oil has excellent low-temperature operating properties for reliable performance in cooler conditions.
Where is this oil made? Sierra 25W-40 FC-W Stern Drive Oil is made in the USA.
What container does the oil come in? Both the Quart and 5 Quart sizes of Sierra 18-9400 oil are packaged in bottle containers.