{"product_id":"mercury-v8-4-6l-four-stroke-300-hour-service-kit-seapro-and-proxs-with-torpedo-lower-unit-only-8m0149931","title":"Mercury – 300 Hour Maintenance Kit | 4.6L V8 SeaPro \u0026 Pro XS CMS | Full Service Components | 8M0149931","description":"\u003ch2\u003e\u003cspan data-preserver-spaces=\"true\"\u003eMercury – 300 Hour Maintenance Kit | 4.6L V8 SeaPro \u0026amp; Pro XS CMS | Full Service Components | 8M0149931\u003c\/span\u003e\u003c\/h2\u003e\n\u003ch3\u003e\u003cspan data-preserver-spaces=\"true\"\u003eOverview\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eThere’s something reassuring about knowing your engine is ready for another long season before you even leave the dock. When you fish hard, run long distances, or put real hours on your boat, having a dependable maintenance routine becomes part of the rhythm of boating. The Mercury 300 Hour Maintenance Kit 8M0149931 brings that peace of mind into one neatly organized package. You open the box, look over the parts, and you just know — everything you need to keep your V8 running smooth, cool, and confident is right here. It’s the kind of kit that makes you feel prepared, whether you’re chasing early-morning bait schools or hauling gear back across rough afternoon chop.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan data-preserver-spaces=\"true\"\u003eKey Features\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eComplete 300-hour service kit for Mercury 4.6L V8 SeaPro and Pro XS engines\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan data-preserver-spaces=\"true\"\u003eDesigned for \u003c\/span\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eConventional MidSection (CMS)\u003c\/span\u003e\u003c\/strong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e models with serial number 2B529482 and above\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan data-preserver-spaces=\"true\"\u003eIncludes \u003c\/span\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eoil filter, fuel filter, oil drain seal, spark plugs, thermostat, alternator belt, water pump repair kit, and anodes\u003c\/span\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003ePremium internal pleat-count filters for high-efficiency filtration\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eHeavy-duty electroplated housings for corrosion resistance\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eEngineered to meet strict Mercury Marine OEM standards for reliability\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan data-preserver-spaces=\"true\"\u003eEngine \u0026amp; Boat Compatibility\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eMercury 4.6L V8 SeaPro outboards\u003c\/span\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eMercury 4.6L V8 Pro XS outboards\u003c\/span\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan data-preserver-spaces=\"true\"\u003eCompatible with \u003c\/span\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eCMS (Conventional MidSection)\u003c\/span\u003e\u003c\/strong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e platforms as well as \u003cstrong\u003eTorpedo lower units\u003c\/strong\u003e.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eIdeal for high-hour commercial vessels, guide boats, offshore rigs, bay boats, and heavy-use fishing setups\u003c\/span\u003e\u003c\/li\u003e\n\u003cli style=\"font-weight: bold;\"\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eNot compatible with Torque Master lower units\u003c\/span\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan data-preserver-spaces=\"true\"\u003ePerformance \u0026amp; Practical Benefits\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eThis kit isn’t just a box of parts — it’s a full reset for an engine that works hard. Ea\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ech component plays its role in bringing back that tight, refined feel you notice right after a service. Fresh filters clear out the restriction that slowly builds over time, letting your engine breathe freely. New spark plugs sharpen throttle response, giving you that crisp ignition snap that makes a V8 sound alive. Th\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ee thermostat and water pump components help keep temperatures steady, which matters a lot on long runs where even small cooling inconsistencies can add up.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eYou’ll also appreciate how precise the alternator belt fitment is. A worn belt can squeal, slip, or create tiny fluctuations you may not hear — but you’ll definitely feel them in uneven charging or battery strain. Replacing it during your 300-hour service keeps electrical systems stable and strong.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eAnd those anodes? They’re your quiet guardians, taking the punishment so your engine’s internal metal doesn’t. Swapping them out ensures continued protection, especially if you run in brackish or saltwater environments.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eThe whole kit installs cleanly because every part is designed for your exact engine. No guesswork, no hunting down mismatched components. Just a solid day of maintenance that rewards you every time you push the throttle forward.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan data-preserver-spaces=\"true\"\u003eWhy Buy OEM\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eMercury builds each part to match your engine’s tolerances exactly\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eReliable long-term protection for high-hour engines\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eFilters and seals last longer and perform better than most aftermarket options\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eSaves money by preventing premature wear and bigger repair bills\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eEverything fits correctly the first time — no frustration, no surprises\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eIf a fellow boater asked which kit to trust, you’d point them to this one. It’s simply the most reliable way to service a hardworking V8.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan data-preserver-spaces=\"true\"\u003eFAQ\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ1: Which engines does this kit fit?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e It \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003efits Mercury \u003c\/span\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e4.6L V8 SeaPro and Pro XS CMS\u003c\/span\u003e\u003c\/strong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e outboards with serial numbers \u003c\/span\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e2B529482 and higher\u003c\/span\u003e\u003c\/strong\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 aftermarket service kits?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e OEM parts match Mercury’s exact specifications, ensuring tighter fitment, longer life, and dependable performance.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ3: How do I know this is the correct kit for my engine?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e M\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eatch your serial number and confirm your motor uses the Conventional MidSection design.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ4: Can this kit be used for saltwater boats?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Absolutely — the included anodes and corrosion-resistant components are ideal for both saltwater and freshwater use.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ5: Is installation manageable for most boat owners?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Yes. Anyone familiar with routine outboard service will find the process straightforward, especially with all parts included.\u003c\/span\u003e\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":45626532397347,"sku":"8M0149931","price":418.48,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/8M0149931_Main.jpg?v=1760631432","url":"https:\/\/partsvu.com\/en-ca\/products\/mercury-v8-4-6l-four-stroke-300-hour-service-kit-seapro-and-proxs-with-torpedo-lower-unit-only-8m0149931","provider":"PartsVu","version":"1.0","type":"link"}