18-9420-2: OIL ENGINE, Sierra

18-9420-2 Comparison

18-9420-2 in New Condition
photo	price	summary	rating
Details	$7.99	Condition is New, New Sierra 10W30 4-Stroke Outboard Oil Replaces Mercury #772733, #18-9420-2, shipping cost = $5.00	99.7%
Details	$4.70	Condition is New, Sierra Marine 18-9420-2 4-Stroke Engine Oil OEM New Factory Boat Parts, shipping cost = $10.95	99.8%
Details	$14.95	Condition is New, Sierra 1 Quart 10W-30 4 Stroke Outboard Engine Oil 18-9420-2, FREE SHIPPING	99.8%
Details	$7.68	Condition is New, Sierra Boat Marine Premium Blend 4-Stroke SAE 10W-30 Engine Oil 1 Quart 18-9420 , shipping cost = $15.10	97.7%
Details	$24.12	Condition is New, Sierra 18-9420-2 10W-30 FC-W 4-Stroke Marine Engine Oil, 1 Quart, FREE SHIPPING	100.0%
Details	$24.16	Condition is New, Fits For Sierra Marine 18 9420 2 10W30 Oil Qt, FREE SHIPPING	99.3%
Details	$24.40	Condition is New, Sierra Oil - 10W30 Oil, Quart, 18-9420-2, FREE SHIPPING	99.9%
Details	$11.25	Top Pick! Condition is New, Sierra 10W30 Oil Quart #18-9420-2, shipping cost = $14.10	99.5%
Details	$15.46	Condition is New, Sierra 1 Quart 10W-30 4 Stroke Outboard Engine Oil 18-9420-2, shipping cost = $12.95	100.0%
Details	$27.33	Condition is New, Sierra Premium Blend FC-W 4-Stroke Marine Engine Oil 10W-30 - Quart, FREE SHIPPING	99.4%
Details	$28.15	Condition is New, SIERRA SIE-18-9420-2 10W-30 Engine Oil Quart Synthetic Blend FC-W 4-Stroke , FREE SHIPPING	99.6%
Details	$29.55	Top Pick! Condition is New, Sierra 18-9420-2 10W-30 4-Stroke Marine Outboard Engine Oil - 1 Gallon, white, 1, FREE SHIPPING	98.9%
Details	$16.92	Condition is New, Sierra 18-9420-2 10W30 FCW 4Stroke Outboard Oil, Qt, shipping cost = $16.45	99.1%
Details	$27.95	Condition is New, Sierra Boat Marine Premium Blend 4-Stroke SAE 10W-30 Engine Oil SET of 4 Quarts, shipping cost = $22.55	97.7%
Details	$200.00	Top Pick! Condition is New, Sierra 18-9420-2 4 Stroke Oil 10W-30FC-W-Quart Carton of 12, shipping cost = $26.11	100.0%

Sierra 18-9420-2 10W-30 FC-W 4-Stroke Marine Engine Oil is a premium quality product specifically designed for use in 4-stroke outboard marine engines. This engine oil is manufactured by Sierra, a reputed name in the automotive and marine industries, known for its commitment to providing top-notch lubrication solutions.

The Sierra 10W-30 FC-W Marine Engine Oil is formulated using advanced technology and high-quality base oils. It is designed to meet the demanding requirements of marine environments, offering excellent protection against corrosion, cavitation, and oxidation. This oil is also suitable for use in both freshwater and saltwater applications.

This 10W-30 oil offers excellent cold flow properties, ensuring that it flows freely even in the coldest of temperatures. This feature is essential for marine engines, which are often used in cold climates. The oil's 10W viscosity rating ensures that it provides reliable lubrication during engine start-up, even in sub-zero temperatures.

The FC-W rating of this oil signifies that it meets the requirements of the Ford Mercury Commercial Warranty. This means that using this oil in your marine engine will not void the manufacturer's warranty.

The Sierra 18-9420-2 10W-30 FC-W Marine Engine Oil is designed to provide superior engine performance and protection. It offers excellent wear protection, preventing engine components from wear and tear. It also provides excellent fuel economy, helping you save on fuel costs.

This oil is also compatible with most marine engine technologies, including those with aluminum cylinder liners. It is also suitable for use in both 2-stroke and 4-stroke engines, although it is primarily marketed for 4-stroke engines.

The Sierra 18-9420-2 10W-30 FC-W Marine Engine Oil comes in a convenient quart container, making it easy to transport and store. It is also backed by a reliable brand, giving you peace of mind knowing that you are using a high-quality product that is specifically designed for your marine engine.

Sierra Marine SIERRA 18-9420-2 10W-30 FC-W 4-stroke Marine Engine Oil is a synthetic blend oil specifically designed for use in 4-stroke outboard and inboard marine engines. Here are some pros and cons of buying this oil:

Pros:

1. Synthetic blend technology provides excellent performance in extreme temperatures, ensuring optimal engine protection.

2. Meets or exceeds the requirements of most major marine engine manufacturers, including Mercury, Yamaha, and Evinrude.

3. Contains detergent additives that help keep the engine clean and prevent carbon build-up.

4. Provides excellent lubrication, reducing engine wear and tear.

5. Meets the requirements of the National Marine Manufacturers Association (NMMA) FC-W standard.

Cons:

1. May be more expensive compared to conventional mineral oils.

2. Some users have reported that the oil can leave a slight film on the water surface, although this is not a major concern for most boat owners.

In conclusion, Sierra Marine SIERRA 18-9420-2 10W-30 FC-W 4-stroke Marine Engine Oil is an excellent choice for boat owners who want to ensure optimal engine performance and protection, especially in extreme temperatures. Its synthetic blend technology, detergent additives, and compatibility with major marine engine manufacturers make it a top pick. While it may be more expensive than conventional mineral oils, the benefits it provides outweigh the additional cost.

Recommendation:

If you're looking for a high-performance marine engine oil that provides excellent protection and compatibility with major marine engine manufacturers, then the Sierra Marine SIERRA 18-9420-2 10W-30 FC-W 4-stroke Marine Engine Oil is a great option to consider. Its synthetic blend technology, detergent additives, and NMMA FC-W certification make it a reliable choice for boat owners who demand the best for their engines.

Details:

Low temperature viscosity offers better cold starting. Every new Sierra part comes with a limited lifetime warranty that covers the useful life of product against any defects in workmanship and materials. Formulated to meet or exceed the tough requirements of Marine 4-stroke motor manufacturers.: Sierra 18-9420-2 10w-30 fc-w 4-stroke engine oil.

Every country is different. Describe the nature of problem and its urgency include pictures if possible. Features, highly refined petroleum product formulated with premium base stock and highly additives. Formulated to offer maximum corrosion protection.

Items heading outside the USA cannot be used for military or government applications. Reduces friction. Excellent anti-wear characteristics. Sierra products are engineered to meet or exceed oem standards, and stand up in harsh Marine environments.

About Sierra. Be sure to enter an accurate reason and for the return. Meets and exceeds quality performance API SJ, cf-2, ch-4, Nam fc-w certified. Pickup is not available.

Specifications, bottle size: 1 quart. Reduces sludge keeping the engine cleaner for better efficiency. Warranty, defects, damage, and other problems: this item has a limited lifetime warranty covering any manufacturer defects.

specifications inboardfuel:

for models: Marine
brand: Sierra
mpn: 18-9420-2
upc: 808282101138
type: Engine Oil
country of manufacture: United States
item weight: 1.92 Lb
size: 1 Quart

payments inboardfuel:

wallet: apple-pay
credit card: discover
other

offer inboardfuel:

availability: in stock
started: january 8, 2026
options: ship-to-home
sold #: 12
prices: $4.70–$200.00
item condition: New

seller inboardfuel:

# reviews: 41858
rating: 100.0%
city: everett, washington

general inboardfuel:

category: Boat Parts > Inboard Engines Components > Intake Fuel Systems

returns inboardfuel:

time: 60 days
policy: returns accepted
paid by: seller

shipping inboardfuel:

transit: 4-7 days
class: standard
service: standard
type: fixed

rating: 100.0% out of 100 based on 858 user ratings.