Sierra 10W30 4-Stroke Marine Outboard Engine Oil - Available in Quart and Gallon
Sierra 10W30 4-Stroke Marine Outboard Engine Oil - Available in Quart and Gallon
Sierra 10W30 4-Stroke Marine Outboard Engine Oil is a premium blend lubricant formulated specifically for the demands of 4-stroke outboard motors. The 10W-30 viscosity offers better cold-starting performance while reducing sludge buildup, helping keep the engine cleaner and running more efficiently over time. It is formulated to meet or exceed the requirements set by 4-stroke marine motor manufacturers and is certified to API SJ, CF-2, and CH-4 performance standards, as well as NMMA FC-W certified for marine service.
This oil is packaged in a bottle and is sold as a single unit in your choice of size, making it easy to keep the right amount of oil on hand whether you are doing a routine top-off or a full oil change. As a 4-stroke formulation, it is intended for outboard engines that require 4-stroke oil rather than 2-stroke oil/fuel mix.
Specifications
- Brand: Sierra
- Manufacturer Part Number: 18-9420
- Type: 4-Stroke Marine Outboard Engine Oil
- Viscosity Grade: 10W-30
- Certifications: API SJ, CF-2, CH-4; NMMA FC-W Certified
- Container Type: Bottle
- Unit Count: 1 per bottle
- Sizes Available: Quart, Gallon
Sizes & Options
This oil is offered in two bottle sizes to match how you use it. Choose the Quart size for topping off oil levels or smaller jobs, or choose the Gallon size for a full oil change or if you run through oil more quickly. Select the size you need from the options above; both sizes contain the same 10W30 4-Stroke formulation.
Frequently Asked Questions
What size options are available for this oil? Sierra 10W30 4-Stroke Marine Outboard Engine Oil (part 18-9420) is sold in a Quart bottle or a Gallon bottle, so you can pick the amount that matches your oil change or top-off needs.
Is this oil for 2-stroke or 4-stroke outboard engines? This is a 4-Stroke formulation, meant for 4-stroke outboard motors rather than 2-stroke engines that require an oil/fuel mix.
What viscosity grade is this oil? It is a 10W-30 viscosity blend, chosen for its low-temperature viscosity that supports easier cold starting in outboard engines.
What certifications does this oil carry? The 10W30 formulation meets API SJ, CF-2, and CH-4 performance standards and is NMMA FC-W Certified for marine use.
How do I choose between the Quart and Gallon size? Pick the Quart of Sierra 18-9420 10W30 4-Stroke oil for smaller top-offs, or the Gallon size if you are doing a complete oil change or need a larger supply on hand.
Does this oil help reduce engine sludge? Yes, the 10W-30 blend is formulated to reduce sludge buildup, which helps keep the outboard engine cleaner and running more efficiently.
What container does the oil come in? Both the Quart and Gallon sizes of Sierra 18-9420 10W30 4-Stroke oil are packaged in bottles.
Is this a genuine Sierra product? Yes, this is genuine Sierra-branded 10W30 4-Stroke Marine Outboard Engine Oil, part number 18-9420.
How many bottles come in an order? Each order is for a single bottle, available as either a Quart or a Gallon of Sierra 18-9420 10W30 4-Stroke oil.
Will this oil work for cold-weather starting? The 10W-30 grade's low-temperature viscosity is designed to offer better cold starting compared to heavier grades.