Sierra 10W-30 Full Synthetic Marine Engine Oil - Available in Quart and Gallon Sizes
Sierra 10W-30 Full Synthetic Marine Engine Oil - Available in Quart and Gallon Sizes
Sierra 10W-30 Full Synthetic Marine Engine Oil is a special blend of synthetic base oil and a balanced additive system engineered specifically for 4-stroke outboard and sterndrive engines. The formula exceeds FC-W requirements and is NMMA FC-W Certified as well as API-SL rated, making it suitable across outboard and sterndrive applications alike.
The synthetic base stock delivers faster lubrication at startup in low temperatures, so critical engine components get protected oil flow sooner on cold mornings. At the other end of the temperature range, the formula holds up under high heat, maintaining film strength and protection during sustained running. A balanced additive package gives the oil greater resistance to oxidation, which translates to lower oil consumption over the service interval and more consistent protection between changes.
This oil is offered as a single product line across two container sizes so boat owners can buy the right quantity for their engine's oil capacity and change interval. The Quart size (946 ml) suits smaller top-offs or engines with lower oil capacities, while the Gallon size is a more economical option for full oil changes or engines that require larger fill volumes. Both sizes contain the same 10W-30 full synthetic formulation.
Specifications
- Brand: Sierra
- Manufacturer Part Number: 18-9690
- Product Type: 10W-30 Full Synthetic Marine Engine Oil
- Viscosity Grade: 10W-30
- Certification: NMMA FC-W Certified, API-SL
- Recommended Use: 4-stroke outboard and sterndrive engines
- Container Type: Bottle
- Available Sizes: 1 Quart (946 ml), 1 Gallon
- UPC (Quart): 808282184353
- UPC (Gallon): 808282184360
Sizes & Options
This oil is sold in two sizes on one product line: Quart (946 ml) for smaller top-offs and Gallon for full oil changes or larger-capacity engines. Choose the Quart for topping off between changes or for engines with small oil capacities, and choose the Gallon for a complete oil change or to keep a larger reserve on hand. Both sizes are the same 10W-30 full synthetic formulation, so the choice comes down to the volume you need.
Frequently Asked Questions
What size options does Sierra 10W-30 Synthetic Marine Engine Oil come in? Sierra 10W-30 Full Synthetic Marine Engine Oil is available in two sizes: a 1 Quart (946 ml) bottle and a 1 Gallon container, both containing the same full synthetic formulation.
Is this oil certified for marine engines? Yes, Sierra 10W-30 Full Synthetic Marine Engine Oil is NMMA FC-W Certified and rated API-SL, meeting the certification standard required for 4-stroke outboard and sterndrive engines.
Which engines is this oil designed for? This 10W-30 full synthetic formula is formulated specifically for 4-stroke outboard and sterndrive engine technology and is recommended for use in both outboard and sterndrive applications.
How do I decide between the Quart and Gallon size? Choose the Quart (946 ml) of Sierra 10W-30 Synthetic Marine Oil for topping off oil levels or for engines with smaller oil capacities, and choose the Gallon size for a full oil change or to keep a larger supply on hand; both sizes are the identical formulation.
Does this oil perform well in cold weather starts? Yes, the synthetic base oil in this Sierra 10W-30 blend offers faster lubrication at startup in low temperatures, helping protect engine components sooner on cold starts.
How does this oil handle high engine temperatures? Sierra 10W-30 Full Synthetic Marine Engine Oil provides excellent protection at high temperatures thanks to its balanced additive system and synthetic base oil.
Will this oil reduce oil consumption between changes? The balanced additive system in this 10W-30 synthetic oil gives greater resistance to oxidation, which results in lower oil consumption compared to a non-synthetic formulation.
Is this a full synthetic oil or a blend? Sierra 18-9690 is a full synthetic marine engine oil, using a special blend of synthetic base oil combined with a balanced additive system that exceeds FC-W requirements.
What container does the Quart size come in? The Quart size of Sierra 10W-30 Full Synthetic Marine Engine Oil (946 ml) is packaged in a bottle.
Can I use this oil in a 2-stroke engine? No, Sierra 10W-30 Full Synthetic Marine Engine Oil is formulated for 4-stroke outboard and sterndrive engine technology, not 2-stroke applications.
What is the viscosity grade of this Sierra marine oil? This product is a 10W-30 viscosity grade full synthetic marine engine oil.