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Sierra 18-9690-3 10W-30 FC-W Synthetic Blend Marine Engine Oil, 1 Gallon

Manufacturer

Sierra

<p>For nearly six decades, Sierra has established itself as one of the marine industry's most trusted names in aftermarket engine and drive parts. Founded as a specialized marine parts manufacturer, Sierra has grown into a comprehensive supplier of replacement components, instrumentation, and accessories for both recreational and commercial boating applications. Operating from their 300,000-square-foot distribution center in Litchfield, Illinois, Sierra serves boat owners and marine technicians worldwide with an extensive catalog of parts engineered specifically for the harsh saltwater environment.</p><h3>Marine Engine Excellence</h3><p>Sierra's reputation was built on delivering precision-engineered internal engine components and drive system parts that meet or exceed OEM specifications. Their <a href="/7570-sierra-engine-gasket-set-5404">engine gasket sets</a> provide critical sealing solutions for inboard and outboard motors, while their <a href="/7570-sierra-engine-complete-assembly-15341">engine complete assemblies</a> offer comprehensive replacement options for major overhauls. Each component undergoes rigorous testing to ensure reliability in demanding marine conditions, from corrosion resistance to temperature cycling performance.</p><h3>Instrumentation and Monitoring Systems</h3><p>Accurate instrumentation is essential for boat operators to monitor engine health and prevent costly breakdowns on the water. Sierra's comprehensive line of <a href="/7570-sierra-gauges-200483">gauges</a> includes everything from fuel pressure and temperature indicators to voltmeters and trim gauges, all designed with marine-grade materials that withstand vibration, moisture, and UV exposure. Their <a href="/7570-sierra-tachometer-gauge-1488">tachometer gauges</a> deliver precise RPM readings critical for optimizing engine performance and fuel efficiency. Supporting these instruments, Sierra's <a href="/7570-sierra-gauge-resistor-47908">gauge resistors</a> ensure proper signal conditioning and accurate readings across various sensor types and engine configurations.</p><h3>Expanded Product Portfolio</h3><p>In 2022, Sierra significantly broadened its scope beyond traditional marine engine parts to encompass a wider range of boating accessories and even outdoor power equipment components. This strategic expansion brought established marine brands like Shields and Moeller under the Sierra umbrella, creating a one-stop resource for marine maintenance and replacement parts. The company now offers fuel systems, electrical components, battery charging solutions, and NMEA electronics alongside their traditional engine parts lineup.</p><h3>Quality Backed by Industry-Leading Warranties</h3><p>What sets Sierra apart in the crowded aftermarket marine parts market is their commitment to standing behind every component they manufacture. Their warranty coverage extends beyond simple part replacement—it includes shop labor, haul-out fees, towing charges, and related incidental costs should a warrantied part fail. This comprehensive protection reflects the company's confidence in their manufacturing processes and quality control standards. For boat owners facing repairs far from shore or mechanics working on customer vessels, this peace of mind is invaluable. Whether you're maintaining an outboard motor, rebuilding an inboard engine, or upgrading your boat's instrumentation, Sierra's decades of marine industry experience and commitment to quality make them a reliable choice for keeping your vessel running at peak performance.</p>

Part Number

18-9690-3
06/02/2036 1:49 PM
Sale Price

$61.22

In Stock (10+)

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Usually delivered within 2 days

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No Hassle Returns

No Hassle Returns

Live-in-stock inventory

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Fitment guaranteed

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Product Details

Sierra 18-9690-3 is a premium synthetic blend marine engine oil formulated specifically for 4-stroke outboard and sterndrive applications. This advanced lubricant combines high-quality synthetic base oils with a precisely balanced additive system that exceeds FC-W (Four-Cycle Water-Cooled) certification requirements set by the National Marine Manufacturers Association (NMMA).

Key Features:

  • 10W-30 viscosity grade provides excellent protection across a wide temperature range
  • Synthetic blend formula offers superior performance over conventional oils
  • Exceeds FC-W marine engine oil standards for 4-stroke marine engines
  • Advanced additive package protects against wear, corrosion, and deposit formation
  • Specifically engineered for the unique demands of marine environments
  • Suitable for both outboard and sterndrive engines

This marine-grade oil provides enhanced protection against the challenging conditions found in saltwater and freshwater environments, including moisture contamination, extended idle periods, and varying load conditions. The synthetic blend formulation helps maintain engine cleanliness, reduces friction, and extends engine life. Each container holds one gallon of oil, providing convenient quantity for routine maintenance.

Products specifications

Grade

10W30

Size

Gallon

Easy checkout

need more info on page for parts like what engine is in your car other then that everything was great

Thanks!

its good so far i would need to see hows the shipping

Thank You

Great price, free shipping and offered Amazon payments!!

user friendly and i like that its bb accredited

Awesome price! Shipping could be faster, but it was fast enough. Will deff buy again.

good seller

Found what I needed at an unbeatable price, easy purchase! No issues

Easy ordering

Fast and inexpensive. Thanks.

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