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Sierra 18-9551-6 10W40 FC-W 4-Cycle Outboard Synthetic Blend Oil 16 Gallon Drum

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

18-9551-6
06/21/2036 9:37 AM
Sale Price

$615.19

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Product Details

Sierra 18-9551-6 is a premium synthetic blend 10W40 4-cycle marine engine oil specifically formulated for outboard and inboard applications. This high-performance oil meets NMMA FC-W and API SL specifications, ensuring superior protection for marine engines operating in demanding conditions.

Key Features:

  • NMMA FC-W and API SL certified for marine 4-cycle engines
  • 10W40 viscosity grade provides excellent performance across a wide temperature range
  • Synthetic blend formula delivers enhanced engine protection and performance
  • Superior rust and corrosion protection designed for harsh marine environments
  • Suitable for all outboard and inboard engines without catalytic converters
  • 16 gallon drum for high-volume applications and fleet maintenance

This marine-grade oil provides critical protection against the unique challenges of saltwater and freshwater operation, including moisture contamination, salt corrosion, and extreme operating temperatures. The synthetic blend formulation offers improved oxidation stability and deposit control compared to conventional oils, helping extend engine life and maintain peak performance.

Products specifications

Grade

10W40

Size

16 Gallon

had the part I needed at the most competitive price and easy to find/purchase from their site.

Quick checkout, Fast shipping, and a great product.

Wicked fast shipping! 3 days from California to Key West, Florida! We are amazed by this super fast service. Part is brand new and fits perfectly! Will use you again and HIGHLY recommend you!

Good price and great to know where to find these kind of conectors

Awsome service and prices,Thanks alot

On line ordering very easy. Called before hand and customer service was great.......

The ordering experience was painless. Good price too.

hope it gets here quickly

easy

I ordered the part from Autoplicity and it arrived in time and is a great product<br>

This was my first order with Autoplicity. Not only did they have the products I wanted at the lowest price, but they offered the best service and lightning fast shipping!!!

Quick and easy. Plus a great deal can't be beat

Good so far. Will see on shipping and part. Thanks

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