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Sierra 18-9552-3 25W-50 FC-W 4-Cycle Outboard Synthetic Blend Oil 4 Liter

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

18-9552-3
06/21/2036 2:10 PM
Sale Price

$45.31

In Stock (8)

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Usually delivered within 2 days

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Product Details

Sierra 18-9552-3 is a premium 25W-50 synthetic blend oil specifically formulated for marine 4-cycle outboard and inboard engines without catalytic converters. This high-performance oil meets NMMA FC-W and API SL specifications, ensuring superior protection for marine engines operating in demanding conditions.

Key Features:

  • 25W-50 viscosity grade provides excellent protection across a wide temperature range
  • NMMA FC-W certified for marine 4-cycle engines
  • API SL rated for superior engine protection
  • Synthetic blend formula offers enhanced lubrication and thermal stability
  • Special marine additives protect against rust and corrosion in saltwater and freshwater environments
  • Reduces engine wear and extends engine life
  • 4-liter bottle provides convenient quantity for oil changes

This oil is ideal for recreational and commercial marine applications where maximum engine protection is required. The synthetic blend formulation provides better flow characteristics at startup and maintains viscosity at high operating temperatures, making it perfect for the unique demands of marine engines.

Products specifications

Grade

25W50

Size

4-Liter

Good so far with a lot details about parts. very good prices

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Easy

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Quick and easy

My order arrived on time and was priced right

Outstanding

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Amazingly fast shipping. Item came as ordered & properly packaged. I received item faster than expected & on time for my father in law's birthday. Will definitely use Autoplicity again.

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