{"title":"Mercury 15 HP \u0026 20 HP 300 Hour Service Maintenance Kits - S\/N 0R235949 - 0R833819","description":"\u003cp\u003eMercury Marine 100-hour maintenance kits and Mercury Marine 300-hour maintenance kits are available for 15 \u0026amp; 20 HP outboards. These kits contain genuine Mercury Marine outboard parts, conveniently assembled to meet the service needs of your Mercury 15 \u0026amp; 20 HP outboard.\u003c\/p\u003e\n\u003cp\u003eEach kit contains the outboard parts and products you need for proper Mercury-directed 100-hour or 300-hour service. Kits include parts and products such as Mercury outboard oil filters, Mercury gearcase drain seals, Mercury gear lube, Mercury thermostat kits, Mercury fuel filters, NGK spark plugs, Mercury anodes, belts, Mercury water pump repair kits, Mercury in-line fuel filters, Mercury fuel rail filters. Additionally, each Mercury 100-hour service kit or Mercury 300-hour service kit includes the proper amount of Mercury-specified oil and Mercury Precision Lubricants High Performance Gear Lube.\u003c\/p\u003e\n\u003cp\u003eEach kit contains the outboard parts and products you need for proper Mercury-directed Marine Mercury 15 HP \u0026amp; 20 HP 300 Hour Service Maintenance Kits - S\/N 0R235949 - 0R833819. Kits include parts and products such as Mercury outboard oil filters, Mercury gear-case drain seals, Mercury gear lube, Mercury thermostat kits, Mercury fuel filters, NGK spark plugs, Mercury anodes, belts, Mercury water pump repair kits, Mercury in-line fuel filters, Mercury fuel rail filters. Additionally, each Mercury 100-hour service kit or Mercury 300-hour service kit includes Mercury Precision Lubricants like Mercury 10W-30 Marine Oil, Mercury 25W-40 Marine Oil, Mercury 25W-40 Synthetic Blend Marine Oil, and Mercury Precision Lubricants High Performance Gear Lube. Mercury Marine is dedicated to advancing boating performance by continually re-inventing the science and engineering behind every Mercury product. So that you can go faster, go farther, go boldly.\u003c\/p\u003e\n\u003cp\u003eMercury Marine Mercury 15 HP \u0026amp; 20 HP 300-Hour Service Maintenance Kits - S\/N 0R235949 - 0R833819 contain genuine Mercury Marine outboard parts, conveniently assembled to meet the service needs of your specific Mercury engine.\u003c\/p\u003e","products":[{"product_id":"mercury-15-20-hp-300-hour-service-kit-8m0120838-s-n-0r235949-0r833819","title":"Mercury – 300 Hour Maintenance Kit | FourStroke Service Package | Complete Engine Care Components | 8M0120838","description":"\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eMercury 15-20 HP EFI – 300 Hour Maintenance Kit | FourStroke Service Package | Complete Engine Care Components | 8M0120838\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\"\u003eIf you run a 15–20 horsepower Mercury FourStroke, you already know what these little engines are capable of. They’re the quiet, steady companions that get you out before sunrise, push you upriver when the wind turns stubborn, and carry you home after a long day on the flats. Hitting the 300-hour mark is more than just a maintenance interval—it’s a milestone that shows just how much time you’ve spent on the water.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eThe Mercury 8M0120838 300 Hour Maintenance Kit is built for boaters who’d rather do the job once and do it right. Everything you need for a full, no-compromises service comes neatly organized in one box. No tracking down part numbers, no second-guessing whether the filter is the right one. Just a complete kit engineered to renew the heart of your outboard so it keeps running tight, smooth, and steady for another season.\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\"\u003eFull 300-hour maintenance kit for select Mercury 15–20hp FourStroke engines.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eIncludes oil filter, fuel filter, spark plugs (three), thermostat and gaskets, oil drain seal, gearcase seals, water pump impeller kit, and unit anode.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eHigh-pleat fuel and oil filters provide exceptional filtration and long service life.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eHeavy-duty electroplated housings deliver superior corrosion resistance.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eComponents are engineered to Mercury Marine specifications for precise fit and performance.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eComplements Mercury 4-Stroke 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 15–20hp FourStroke outboards\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eWorks with engines from serial number 0R235168 through 0R833819\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eIdeal for jon boats, utility skiffs, aluminum fishing boats, inflatables, and tenders\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan data-preserver-spaces=\"true\"\u003eS\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003euitable for 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\"\u003eOnce you install the parts in this kit, the difference isn’t subtle—you hear it, you feel it, and you trust it. New spark plugs help the engine light off quickly and idle with a calm, even rhythm. Fresh filters keep fuel and oil clean, giving you smoother throttle response and better long-term reliability.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eTh\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ee replacement impeller is one of the biggest upgrades. A crisp, healthy water pump keeps temperatures consistent, even on long upruns or when the current forces the engine to work harder. Updated seals tighten up the gearcase, reducing the chance of water intrusion and helping everything inside live longer.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eWhen your outboard runs cooler, breathes cleaner, and fires instantly, you spend less time worrying and more time enjoying the water. That’s the real purpose of this kit—restoring confidence in the machine that carries you day after day.\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\u003cspan data-preserver-spaces=\"true\"\u003eGenuine Mercury quality ensures reliable, repeatable performance.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eParts fit the first time without improvising or modifying.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eLonger service life compared to many aftermarket components.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eDesigned and tested specifically for Mercury FourStroke platforms.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eProtects your investment by maintaining factory-grade reliability.\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, OEM parts simply last longer and keep your engine behaving the way Mercury designed it to.\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 the 8M0120838 kit fit?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e It fits Mercury 15–20hp FourStroke outboards within serial numbers 0R235168–0R833819.\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 You get Mercury-engineered components with superior filtration, sealing, and durability.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ3: How do I confirm this is the right kit for my outboard?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Match your engine’s serial number to the supported range listed above.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ4: Can I use this kit in freshwater and saltwater environments?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Absolutely—every part is designed to handle harsh marine conditions.\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 If you’re comfortable doing standard maintenance, yes. Otherwise, any Mercury-certified technician can take care of it.\u003c\/span\u003e\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":45626576929059,"sku":"8M0120838","price":283.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/8m0120838_main.jpg?v=1760631492"},{"product_id":"mercury-15-20-hp-complete-300-hour-service-maintenance-kit-10w-30-8m0120838-s-n-0r235949-0r833819","title":"Mercury 15\/20 HP Complete 300 Hour Service Maintenance Kit 10W-30 - 8M0120838 - S\/N 0R235949 - 0R833819","description":"\u003cp\u003eWant to know more about how your engine is breaking-in or wearing? Curious about whether or not your oil is doing its job? Want to be ahead of problems that may develop? PartsVu has partnered with Blackstone Laboratories and we are now offering professional \u003ca href=\"https:\/\/partsvu.com\/collections\/blackstone-laboratories\"\u003eoil analysis kits\u003c\/a\u003e. Results are typically received in a few days via email. \u003ca href=\"https:\/\/partsvu.com\/collections\/blackstone-laboratories\"\u003eShop now\u003c\/a\u003e\u003c\/p\u003e\u003ch2\u003eMercury | 300 Hour Service Kit | 15\/20 HP | 8M0120838\u003c\/h2\u003e\n\n\u003cp\u003eKeep your Mercury 15 HP and 20 HP four-stroke outboard operating at peak performance with the \u003cstrong\u003eMercury 300 Hour Service Kit – 8M0120838\u003c\/strong\u003e. Designed for engines with serial numbers \u003cstrong\u003e0R235949 through 0R833819\u003c\/strong\u003e, this complete maintenance kit includes the key components required for the 300-hour service interval.\u003c\/p\u003e\n\n\u003cp\u003eRoutine maintenance at 300 hours helps refresh lubrication systems, maintain cooling performance, and replace wear items that experience heavy use over time. This kit packages the necessary oils, filtration components, ignition parts, cooling system components, and seals so you can complete the service efficiently and with confidence.\u003c\/p\u003e\n\n\u003chr style=\"margin:24px 0;\"\u003e\n\n\u003ch3\u003eWhat’s Included in This Kit\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e2 x\u003c\/strong\u003e Quarts 10W-30 Engine Oil\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 x\u003c\/strong\u003e Quart Gear Lube\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 x\u003c\/strong\u003e Oil Filter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 x\u003c\/strong\u003e Fuel Filter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 x\u003c\/strong\u003e Oil Drain Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3 x\u003c\/strong\u003e Gearcase Drain Seals\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 x\u003c\/strong\u003e Thermostat\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 x\u003c\/strong\u003e Thermostat Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2 x\u003c\/strong\u003e Spark Plugs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 x\u003c\/strong\u003e Water Pump Impeller Kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 x\u003c\/strong\u003e Anode\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr style=\"margin:24px 0;\"\u003e\n\n\u003ch3\u003eWhy Perform the 300 Hour Service?\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtect engine components:\u003c\/strong\u003e Fresh engine oil helps maintain proper lubrication and reduce wear.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaintain cooling efficiency:\u003c\/strong\u003e A new thermostat and impeller help ensure proper operating temperature.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReliable ignition performance:\u003c\/strong\u003e New spark plugs help promote clean starts and efficient combustion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLower unit protection:\u003c\/strong\u003e Fresh gear lube and new seals help maintain proper gearcase lubrication.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorrosion protection:\u003c\/strong\u003e Replacing the anode helps defend internal components from electrolysis.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr style=\"margin:24px 0;\"\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMercury 15 HP Four-Stroke Outboards\u003c\/li\u003e\n\u003cli\u003eMercury 20 HP Four-Stroke Outboards\u003c\/li\u003e\n\u003cli\u003eSerial Numbers \u003cstrong\u003e0R235949 – 0R833819\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eAlways verify your engine serial number before ordering to ensure compatibility with your Mercury outboard.\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":47125896167715,"sku":"PVM00094","price":339.46,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/8m0120838-1030.jpg?v=1701377083"},{"product_id":"mercury-15-20-hp-complete-300-hour-service-maintenance-kit-10w-30-synthetic-blend-8m0120838-s-n-0r235949-0r833819","title":"Mercury 15\/20 HP Complete 300 Hour Service Maintenance Kit 10W-30 Synthetic Blend - 8M0120838 - S\/N 0R235949 - 0R833819","description":"\u003cp\u003eWant to know more about how your engine is breaking-in or wearing? Curious about whether or not your oil is doing its job? Want to be ahead of problems that may develop? PartsVu has partnered with Blackstone Laboratories and we are now offering professional \u003ca href=\"https:\/\/partsvu.com\/collections\/blackstone-laboratories\"\u003eoil analysis kits\u003c\/a\u003e. Results are typically received in a few days via email. \u003ca href=\"https:\/\/partsvu.com\/collections\/blackstone-laboratories\"\u003eShop now\u003c\/a\u003e.\u003c\/p\u003e\u003ch2\u003eMercury | 300 Hour Service Kit | 15\/20 HP | 8M0120838\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eMercury 300 Hour Service Kit – 8M0120838\u003c\/strong\u003e provides the essential maintenance components required to properly service Mercury \u003cstrong\u003e15 HP and 20 HP four-stroke outboards\u003c\/strong\u003e with serial numbers \u003cstrong\u003e0R235949 through 0R833819\u003c\/strong\u003e. This complete kit simplifies scheduled maintenance by bundling the required oils, filters, cooling system components, ignition parts, and seals needed for the 300-hour service interval.\u003c\/p\u003e\n\n\u003cp\u003eRegular maintenance ensures reliable engine performance, improved fuel efficiency, and long-term durability. By replacing worn service components such as spark plugs, filters, thermostat, and the water pump impeller, this kit helps keep your Mercury outboard running smoothly and operating at the proper temperature while protecting critical internal engine and gearcase components.\u003c\/p\u003e\n\n\u003chr style=\"margin:24px 0;\"\u003e\n\n\u003ch3\u003eWhat’s Included in This Kit\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e2 x\u003c\/strong\u003e Quarts 10W-30 Synthetic Blend Engine Oil\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 x\u003c\/strong\u003e Quart Gear Lube\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 x\u003c\/strong\u003e Oil Filter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 x\u003c\/strong\u003e Fuel Filter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 x\u003c\/strong\u003e Oil Drain Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3 x\u003c\/strong\u003e Gearcase Drain Seals\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 x\u003c\/strong\u003e Thermostat\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 x\u003c\/strong\u003e Thermostat Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2 x\u003c\/strong\u003e Spark Plugs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 x\u003c\/strong\u003e Water Pump Impeller Kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 x\u003c\/strong\u003e Anode\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr style=\"margin:24px 0;\"\u003e\n\n\u003ch3\u003eWhy Perform the 300 Hour Service?\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaintain lubrication performance\u003c\/strong\u003e with fresh synthetic blend engine oil.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtect the lower unit\u003c\/strong\u003e with new gear lube and drain seals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnsure proper cooling\u003c\/strong\u003e with a new thermostat and water pump impeller.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImprove engine efficiency\u003c\/strong\u003e with fresh spark plugs and clean filtration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrevent corrosion\u003c\/strong\u003e by replacing the sacrificial anode.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr style=\"margin:24px 0;\"\u003e\n\n\u003ch3\u003eEngine Compatibility\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMercury 15 HP Four-Stroke Outboards\u003c\/li\u003e\n\u003cli\u003eMercury 20 HP Four-Stroke Outboards\u003c\/li\u003e\n\u003cli\u003eSerial Numbers \u003cstrong\u003e0R235949 – 0R833819\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eAlways confirm your Mercury outboard serial number before ordering to ensure proper fitment.\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":47125896200483,"sku":"PVM00095","price":345.46,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/8m0120838_1030.jpg?v=1701377083"},{"product_id":"mercury-15-20-hp-complete-300-hour-service-maintenance-kit-25w-40-8m0120838-s-n-0r235949-0r833819","title":"Mercury 15\/20 HP Complete 300 Hour Service Maintenance Kit 25W-40 - 8M0120838 - S\/N 0R235949 - 0R833819","description":"\u003cp\u003eWant to know more about how your engine is breaking-in or wearing? Curious about whether or not your oil is doing its job? Want to be ahead of problems that may develop? PartsVu has partnered with Blackstone Laboratories and we are now offering professional \u003ca href=\"https:\/\/partsvu.com\/collections\/blackstone-laboratories\"\u003eoil analysis kits\u003c\/a\u003e. Results are typically received in a few days via email. \u003ca href=\"https:\/\/partsvu.com\/collections\/blackstone-laboratories\"\u003eShop now\u003c\/a\u003e.\u003c\/p\u003e\u003ch2\u003eMercury | 300 Hour Service Kit | 15\/20 HP | 8M0120838\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eMercury 300 Hour Service Kit – 8M0120838\u003c\/strong\u003e provides the key maintenance components needed to properly service Mercury \u003cstrong\u003e15 HP and 20 HP four-stroke outboards\u003c\/strong\u003e with serial numbers \u003cstrong\u003e0R235949 through 0R833819\u003c\/strong\u003e. Designed to simplify scheduled maintenance, this kit includes the oils, filters, cooling system components, ignition parts, and seals required for the 300-hour service interval.\u003c\/p\u003e\n\n\u003cp\u003ePerforming routine maintenance at recommended service intervals helps protect internal engine components, maintain proper cooling system function, and ensure reliable performance on the water. This kit packages everything needed to refresh the lubrication system, replace common wear items, and maintain efficient engine operation.\u003c\/p\u003e\n\n\u003chr style=\"margin:24px 0;\"\u003e\n\n\u003ch3\u003eWhat’s Included in This Kit\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e2 x\u003c\/strong\u003e Quarts 25W-40 Engine Oil\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 x\u003c\/strong\u003e Quart Gear Lube\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 x\u003c\/strong\u003e Oil Filter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 x\u003c\/strong\u003e Fuel Filter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 x\u003c\/strong\u003e Oil Drain Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3 x\u003c\/strong\u003e Gearcase Drain Seals\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 x\u003c\/strong\u003e Thermostat\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 x\u003c\/strong\u003e Thermostat Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2 x\u003c\/strong\u003e Spark Plugs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 x\u003c\/strong\u003e Water Pump Impeller Kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 x\u003c\/strong\u003e Anode\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr style=\"margin:24px 0;\"\u003e\n\n\u003ch3\u003eWhy Perform the 300 Hour Service?\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaintain proper lubrication\u003c\/strong\u003e with fresh engine oil to reduce internal wear.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtect the gearcase\u003c\/strong\u003e with new gear lube and drain seals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnsure proper cooling\u003c\/strong\u003e with a new thermostat and water pump impeller.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImprove ignition performance\u003c\/strong\u003e with fresh spark plugs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduce corrosion\u003c\/strong\u003e by replacing the sacrificial anode.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr style=\"margin:24px 0;\"\u003e\n\n\u003ch3\u003eEngine Compatibility\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMercury 15 HP Four-Stroke Outboards\u003c\/li\u003e\n\u003cli\u003eMercury 20 HP Four-Stroke Outboards\u003c\/li\u003e\n\u003cli\u003eSerial Numbers \u003cstrong\u003e0R235949 – 0R833819\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eAlways confirm your Mercury outboard serial number before ordering to ensure proper compatibility.\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":47125896298787,"sku":"PVM00096","price":339.46,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/8m0120838-2540.jpg?v=1701377083"},{"product_id":"mercury-15-20-hp-complete-300-hour-service-maintenance-kit-25w-40-synthetic-blend-8m0120838-s-n-0r235949-0r833819","title":"Mercury 15\/20 HP Complete 300 Hour Service Maintenance Kit 25W-40 Synthetic Blend - 8M0120838 - S\/N 0R235949 - 0R833819","description":"\u003cp\u003eWant to know more about how your engine is breaking-in or wearing? Curious about whether or not your oil is doing its job? Want to be ahead of problems that may develop? PartsVu has partnered with Blackstone Laboratories and we are now offering professional \u003ca href=\"https:\/\/partsvu.com\/collections\/blackstone-laboratories\"\u003eoil analysis kits\u003c\/a\u003e. Results are typically received in a few days via email. \u003ca href=\"https:\/\/partsvu.com\/collections\/blackstone-laboratories\"\u003eShop now\u003c\/a\u003e.\u003c\/p\u003e\u003ch2\u003eMercury | 300 Hour Service Kit | 15\/20 HP | 8M0120838\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eMercury 300 Hour Service Kit – 8M0120838\u003c\/strong\u003e provides the essential components required to perform the recommended 300-hour maintenance service on Mercury \u003cstrong\u003e15 HP and 20 HP four-stroke outboards\u003c\/strong\u003e with serial numbers \u003cstrong\u003e0R235949 through 0R833819\u003c\/strong\u003e. This kit combines the critical oils, filters, cooling system components, ignition parts, and seals needed to keep your engine running reliably.\u003c\/p\u003e\n\n\u003cp\u003eRegularly performing scheduled maintenance helps protect your outboard’s internal components, maintain proper cooling performance, and ensure dependable operation on the water. This kit simplifies the service process by packaging the necessary maintenance parts together so you can efficiently complete the 300-hour interval service.\u003c\/p\u003e\n\n\u003chr style=\"margin:24px 0;\"\u003e\n\n\u003ch3\u003eWhat’s Included in This Kit\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e2 x\u003c\/strong\u003e Quarts 25W-40 Synthetic Blend Engine Oil\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 x\u003c\/strong\u003e Quart Gear Lube\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 x\u003c\/strong\u003e Oil Filter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 x\u003c\/strong\u003e Fuel Filter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 x\u003c\/strong\u003e Oil Drain Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3 x\u003c\/strong\u003e Gearcase Drain Seals\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 x\u003c\/strong\u003e Thermostat\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 x\u003c\/strong\u003e Thermostat Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2 x\u003c\/strong\u003e Spark Plugs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 x\u003c\/strong\u003e Water Pump Impeller Kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 x\u003c\/strong\u003e Anode\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr style=\"margin:24px 0;\"\u003e\n\n\u003ch3\u003eBenefits of the 300 Hour Service\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaintain engine lubrication\u003c\/strong\u003e with fresh 25W-40 synthetic blend oil.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtect the gearcase\u003c\/strong\u003e with new gear lube and drain seals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaintain cooling system efficiency\u003c\/strong\u003e with a new thermostat and impeller.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImprove ignition performance\u003c\/strong\u003e with fresh spark plugs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrevent corrosion\u003c\/strong\u003e by replacing the sacrificial anode.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr style=\"margin:24px 0;\"\u003e\n\n\u003ch3\u003eEngine Compatibility\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMercury 15 HP Four-Stroke Outboards\u003c\/li\u003e\n\u003cli\u003eMercury 20 HP Four-Stroke Outboards\u003c\/li\u003e\n\u003cli\u003eSerial Numbers \u003cstrong\u003e0R235949 – 0R833819\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eAlways verify your engine serial number before ordering to ensure compatibility with your Mercury outboard.\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":47125896331555,"sku":"PVM00097","price":345.46,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/8m0120838_2540.jpg?v=1701377083"},{"product_id":"blackstone-laboratories-oil-analysis-kit-engine-or-transmission-oil-testing-4-pack","title":"Blackstone Laboratories Oil Analysis Kit - Engine or Transmission Oil Testing - 4-pack","description":"\u003cp\u003ePartsVu has partnered with Blackstone Labratories to give you the opportunity to know exactly how your engine, transmission, gear set, or generator is performing right now, through oil analysis. \u003c\/p\u003e\n\u003cp\u003eYou will receive everything you need to ship an oil sample to the professionals at Blackstone. The lab report will indicate if oil change intervals are on time, if there are contaminants like water, coolant, or salt present, and analyze a full spectrum of metals that might identify premature engine wear before it results in a costly or dangerous failure.\u003c\/p\u003e\n\u003cp\u003eThese oil sample kits can be used with inboard, outboard, gas, and diesel engines. The kits come complete with the following:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSample Bottle\u003c\/li\u003e\n\u003cli\u003ePlastic Bag \u0026amp; Absorbent Mat\u003c\/li\u003e\n\u003cli\u003eExternal Contaminent Bottle\u003c\/li\u003e\n\u003cli\u003ePrepaid Shipping Label to send the oil sample back to Blackstone Labs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eSimply collect a small sample, fill out the sample card and drop the kit in the mailbox. Once Blackstone receives the oil sample, in a few days you will receive an email with the test results and a simplified breakdown of what the results mean. \u003c\/p\u003e\n\u003cp\u003eBlackstone will archive your sample and it can be used for future testing to further determine how your boat is performing over time.\u003c\/p\u003e\n\u003cp\u003eBelow is a sample report:\u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/www.partsvu.com\/pub\/media\/wysiwyg\/BlackstoneLabSample1_2.jpg\"\u003e\u003c\/p\u003e","brand":"PartsVu","offers":[{"title":"Default Title","offer_id":48330423107875,"sku":"PVA00002","price":140.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/blackstone_4pack1_1.jpg?v=1714497760"},{"product_id":"mercury-outboard-winterizing-kit","title":"Mercury Outboard Winterizing Kit","description":"\u003ch2\u003eMercury Outboard Winterizing Kit\u003c\/h2\u003e\n\u003cp\u003ePreparing your Mercury outboard for winter storage doesn’t have to be stressful. The Mercury Outboard Winterizing Kit includes the exact OEM products designed to keep your engine protected during the off-season. To ensure your outboard starts strong next season, it’s essential to address several key components. This includes stabilizing your fuel, coating internal parts, and lubricating high-wear areas. The kit provides flexible size options for fuel stabilizer and grease, and you can also choose to add dielectric grease for enhanced electrical protection. For a full walkthrough of the process, check out our \u003ca href=\"https:\/\/partsvu.com\/blogs\/boating-resources\/winterizing-outboard-motor-mercury-marine-essential-maintenance\" target=\"_blank\"\u003eMercury Winterizing Guide\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Stabilizer – Keeps gas fresh\u003c\/strong\u003e – \u003ca href=\"https:\/\/partsvu.com\/products\/mercury-quickstor-fuel-stabilizer-12-oz-92-8m0047932\" target=\"_blank\"\u003eMercury Quickstor Fuel Stabilizer – 12 oz.\u003c\/a\u003e or \u003ca href=\"https:\/\/partsvu.com\/products\/mercury-quickstor-fuel-stabilizer-32-oz-92-8m0058692\" target=\"_blank\"\u003e32 oz.\u003c\/a\u003e. Prevents phase separation, fights varnish deposits, and helps your engine start easily after months of storage. Perfect for both small tanks and larger multi-tank setups.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFogging Oil – Protects internal parts\u003c\/strong\u003e – \u003ca href=\"https:\/\/partsvu.com\/products\/mercury-storage-seal-fogging-oil-12-oz-92-858081k03\" target=\"_blank\"\u003eMercury Storage Seal Fogging Oil – 12 oz.\u003c\/a\u003e. Coats cylinders and injectors with a corrosion-resistant film to block moisture intrusion and keep metal surfaces from pitting. Essential for long-term engine protection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrease – Fights wear and corrosion\u003c\/strong\u003e – \u003ca href=\"https:\/\/partsvu.com\/collections\/mercury-quicksilver-corrosion-inhibitors-grease\/products\/mercury-2-4-c-marine-grease-with-ptfe-8-oz-92-802859a1\" target=\"_blank\"\u003eMercury 2-4-C Marine Grease – 8 oz.\u003c\/a\u003e or \u003ca rel=\"noopener\" href=\"https:\/\/partsvu.com\/products\/mercury-greasex-14oz-92-8m0190472\" target=\"_blank\"\u003e14 oz. cartridge\u003c\/a\u003e. Specially formulated with PTFE to provide long-lasting lubrication for prop shafts, steering linkages, and fittings. Protects against saltwater intrusion and seizing.\u003c\/li\u003e\n\u003cli\u003eDielectric Grease (Optional) – Safeguards connections – \u003ca href=\"https:\/\/partsvu.com\/products\/permatex-dielectric-tune-up-grease-33-oz-81150\" target=\"_blank\"\u003ePermatex Dielectric Tune-Up Grease – .33 oz.\u003c\/a\u003e. A simple but effective way to keep plugs and terminals free of moisture and corrosion, reducing electrical issues.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM-approved products\u003c\/strong\u003e – Every item in this kit is Mercury-tested and formulated for outboard use, ensuring the right chemistry for your engine.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexibility in size\u003c\/strong\u003e – Choose the bottle or cartridge size that best fits your outboard and fuel system.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSimplifies maintenance\u003c\/strong\u003e – Rather than sourcing items separately, this kit bundles together everything Mercury recommends for proper winterization.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine longevity\u003c\/strong\u003e – Using these products as directed reduces risk of costly repairs, extends engine life, and ensures smoother performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrusted by professionals\u003c\/strong\u003e – The same products marine techs rely on for seasonal prep, now packaged for DIY boaters.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eStoring your boat for the off-season is about prevention. With the Mercury Outboard Winterizing Kit, you effectively protect every essential system — fuel, internal components, moving parts, and electrical systems. It's a wise investment that ensures your outboard remains reliable, efficient, and ready for spring launch.\u003c\/p\u003e\n\u003ch3\u003eFAQs\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this kit compatible with outboards that are not made by Mercury?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: While designed for Mercury, the stabilizer, fogging oil, and grease are high-quality marine-grade products that can be used across most brands. For best results, stick with OEM for your engine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Do I need the larger sizes of stabilizer or grease?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: Not necessarily. The 32 oz. stabilizer and 14 oz. grease cartridge are best for larger tanks or frequent service work. When it comes to single-outboard setups, smaller sizes often do the trick! They pack a punch while keeping things sleek and efficient.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is winterization really necessary if I only store my boat for a couple of months?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: Yes. Even short storage periods can lead to stale fuel, internal corrosion, and seized fittings. A proper winterization routine ensures your engine is protected regardless of downtime.\u003c\/p\u003e","brand":"PartsVu","offers":[{"title":"12 oz. \/ 12 oz. \/ 8 oz. Mercury Grease","offer_id":54304344834339,"sku":"C-PVMP-05442","price":43.97,"currency_code":"USD","in_stock":true},{"title":"12 oz. \/ 12 oz. \/ 8 oz. Mercury Grease + Dielectric Grease (Optional)","offer_id":54304344867107,"sku":"C-PVMP-05443","price":51.09,"currency_code":"USD","in_stock":true},{"title":"12 oz. \/ 12 oz. \/ 14 oz. Mercury Grease","offer_id":54304344899875,"sku":"C-PVMP-05444","price":46.97,"currency_code":"USD","in_stock":true},{"title":"12 oz. \/ 12 oz. \/ 14 oz. Mercury Grease + Dielectric Grease (Optional)","offer_id":54304344932643,"sku":"C-PVMP-05445","price":54.09,"currency_code":"USD","in_stock":true},{"title":"32 oz. \/ 12 oz. \/ 8 oz. Mercury Grease","offer_id":54304344965411,"sku":"C-PVMP-05446","price":55.56,"currency_code":"USD","in_stock":true},{"title":"32 oz. \/ 12 oz. \/ 8 oz. Mercury Grease + Dielectric Grease (Optional)","offer_id":54304344998179,"sku":"C-PVMP-05447","price":62.68,"currency_code":"USD","in_stock":true},{"title":"32 oz. \/ 12 oz. \/ 14 oz. Mercury Grease","offer_id":54304345030947,"sku":"C-PVMP-05448","price":58.56,"currency_code":"USD","in_stock":true},{"title":"32 oz. \/ 12 oz. \/ 14 oz. Mercury Grease + Dielectric Grease (Optional)","offer_id":54304345063715,"sku":"C-PVMP-05449","price":65.68,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/C-PVMP-05442.jpg?v=1756846488"}],"url":"https:\/\/partsvu.com\/en-ca\/collections\/mercury-15-hp-20-hp-300-hour-service-maintenance-kits-s-n-0r235949-0r833819.oembed","provider":"PartsVu","version":"1.0","type":"link"}