Sierra Full Synthetic SAE 30 Engine Oil - Available in Quart and 5 Quart
Sierra Full Synthetic SAE 30 Engine Oil - Available in Quart and 5 Quart
Sierra Full Synthetic SAE 30 Engine Oil is a full synthetic lubricant recommended for gasoline and diesel inboard and sterndrive engines. Its full synthetic base provides longer lubrication effectiveness than conventional mineral-based oils, helping protect critical engine components during startup, normal operation, and storage. The formulation is API CF/SL rated, meeting service requirements for both diesel (CF) and gasoline (SL) applications commonly found in marine inboard and sterndrive powerplants.
Regular use of a full synthetic oil helps reduce oil consumption and can improve fuel economy compared to conventional oils, while its stable synthetic molecular structure resists breakdown under the heat cycling and extended idle periods typical of marine engines. This makes it a suitable choice for engines that see seasonal storage as well as regular operation.
This oil is sold as a single product line offered in two bottle sizes to match different oil change needs: a Quart bottle for topping off or smaller-capacity engines, and a 5 Quart bottle for a full oil change on larger-capacity inboard or sterndrive engines. Always confirm your engine's oil capacity and manufacturer-recommended change interval before purchasing.
Specifications
- Brand: Sierra
- Manufacturer Part Number: 18-9410
- Oil Type: Full Synthetic
- SAE Viscosity Grade: SAE 30
- API Service Rating: API CF/SL
- Recommended Use: Gasoline and diesel inboard and sterndrive engines
- Container Type: Bottle
- Available Sizes: Quart (32 Fluid Ounces), 5 Quart (160 Fluid Ounces)
- Manufacturer Warranty: 90 days
Sizes & Options
Choose the Quart size for topping off oil between changes or for smaller-capacity engines, and choose the 5 Quart size when performing a complete oil change on larger inboard or sterndrive engines. Check your engine's total oil capacity to determine how many bottles you need.
Frequently Asked Questions
What SAE viscosity grade is this oil? Sierra Full Synthetic Engine Oil (part number 18-9410) is an SAE 30 single-grade oil.
Is this oil full synthetic or conventional? It is a full synthetic formulation, which provides longer lubrication effectiveness than conventional mineral-based oils.
What API service rating does this oil meet? The 18-9410 oil is rated API CF/SL, covering both diesel (CF) and gasoline (SL) service requirements.
What engines is this oil recommended for? Sierra recommends this SAE 30 full synthetic oil for gasoline and diesel inboard and sterndrive engines.
What sizes are available for this oil? This oil line is available in a Quart bottle and a 5 Quart bottle, sold as part numbers 18-9410-2 and 18-9410-4 respectively.
How do I choose between the Quart and 5 Quart bottle? Pick the size based on your engine's total oil capacity: use the Quart bottle for topping off or smaller engines, and the 5 Quart bottle for a complete oil change on larger inboard or sterndrive engines.
Will this oil help with fuel economy or oil consumption? Yes, the full synthetic formulation of the 18-9410 oil is designed to reduce oil consumption and can improve fuel economy compared to conventional oils.
Is this oil suitable for engine storage periods? The 18-9410 full synthetic SAE 30 oil is formulated to provide superior engine protection during startups, operation, and storage.
What comes in the package? Each purchase includes a single bottle of Sierra Full Synthetic SAE 30 Engine Oil in the size selected, either Quart or 5 Quart.
Is this a genuine Sierra product? Yes, this is a genuine Sierra-branded full synthetic SAE 30 engine oil, part number 18-9410.