{"product_id":"mercury-8-9-9-standard-gearcase-only-300-hour-service-kit-8m0120837-s-n-0r042475-above","title":"Mercury – 300 Hour Maintenance Kit | FourStroke Service Package | Complete Engine Care Components | 8M0120837","description":"\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eMercury 8-9.9 HP EFI – 300 Hour Maintenance Kit | FourStroke Service Package | Complete Engine Care Components | 8M0120837\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eOverview\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eThere’s a special kind of pride that comes from owning a small FourStroke Mercury outboard. These engines aren’t loud or flashy—they’re quiet workhorses that faithfully push you across glassy coves, help you troll the shallows, or carry you to that tucked-away spot only a few people know about. But even the most reliable outboard needs the occasional deep service, and when the 300-hour mark rolls around, you want the job done right.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eThe Mercury 8M0120837 300 Hour Maintenance Kit gives you everything you need in one clean, organized package. No guessing. No hunting for the \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eright\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e seals or filters. Just the confidence that comes with using parts engineered specifically for your engine. When you fire up the outboard after the service, you’ll hear that smooth, steady hum you’ve always trusted—and know it’s ready for another season of early mornings and long days on the water.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eKey Features\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eComplete 300-hour service kit for select Mercury FourStroke outboards.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan data-preserver-spaces=\"true\"\u003eIncludes fuel filter, thermostat \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eand\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e gaskets, oil drain seal, gearcase seals, spark plugs, water pump impeller kit, and unit anode.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eDesigned to meet strict Mercury Marine engineering standards.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eHigh-pleat fuel and oil filters for superior contaminant capture.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eHeavy-duty electroplated housings for excellent corrosion resistance.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003ePairs seamlessly with Mercury Marine Engine Oil and Premium Gear Lube (sold separately).\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eEngine \u0026amp; Boat Compatibility\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eFits Mercury 8–9.9hp FourStroke carbureted and EFI outboards.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eCompatible with engines from serial number 0R042475 through 1R279944.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eIdeal for inflatable boats, tiller-steer skiffs, jon boats, dinghies, pontoons, and kicker installations on larger fishing boats.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan data-preserver-spaces=\"true\"\u003eSu\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eitable for use in both freshwater and coastal environments.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003ePerformance \u0026amp; Practical Benefits\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eA proper 300-hour service can completely change how your outboard feels. Fresh spark plugs help the engine light off with less effort, especially on chilly mornings. \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eA new fuel filter keeps contaminants from \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003esneaking into\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e the system, \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ewhich means\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e smoother throttle transitions and \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003emore\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e predictable idle.\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Th\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ee impeller kit restores reliable cooling, giving you steady temperature control when you’re running hard against wind or tide.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eReplacing seals and the thermostat helps tighten everything up—no small leaks, no wavering temperatures, no guessing. \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eYou’ll feel the difference in how the engine responds: the idle settles down, acceleration becomes smoother, and the overall operation \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ejust\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e feels more secure and dialed-in.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eIt’s the kind of maintenance that pays you back immediately and continues paying off every time you push away from the dock.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eWhy Buy OEM\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan data-preserver-spaces=\"true\"\u003eGenuine Mercury parts \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eguarantee\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e perfect \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003efitment\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e and long-term durability.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eComponents are engineered specifically for your 8–9.9hp FourStroke platform.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eSuperior filtration and sealing compared to typical aftermarket kits.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eEnsures your outboard maintains Mercury’s performance standards.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eOne dependable package—no mismatched parts or missing pieces.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eAsk any seasoned boater: when it comes to maintenance, cutting corners never pays off. \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eOEM parts \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003esimply\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e last longer and keep your engine running like it should.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eFAQ\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ1: Which engines does part number 8M0120837 fit?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eThis kit fits Mercury 8–9.9hp FourStroke carbureted and EFI outboards \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ein the\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e 0R042475–1R279944 \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eserial range\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ2: What makes this different from an aftermarket kit?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e It includes components engineered to Mercury Marine standards, with higher-quality filtration, seals, and materials.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ3: How do I know if this is the correct kit for my outboard?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Verify your engine’s serial number and confirm it falls within the supported range.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ4: Is this kit suitable for saltwater use?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Yes—every component is designed to withstand harsh marine environments.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ5: Is the 300-hour service manageable for most boat owners?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eIf\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e you’re comfortable with routine outboard maintenance, yes. Otherwise, any Mercury-certified technician can complete the service quickly.\u003c\/span\u003e\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":46935248273699,"sku":"8M0120837","price":184.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/8M0120837_Main.jpg?v=1760631370","url":"https:\/\/partsvu.com\/en-ca\/products\/mercury-8-9-9-standard-gearcase-only-300-hour-service-kit-8m0120837-s-n-0r042475-above","provider":"PartsVu","version":"1.0","type":"link"}