{"product_id":"mercury-8-9-9-complete-300-hour-service-maintenance-kit-standard-gearcase-only-25w-40-synthetic-blend-8m0120837-s-n-0r042475-above","title":"Mercury 8\/9.9 Complete 300 Hour Service Maintenance Kit Standard Gearcase Only 25W-40 Synthetic Blend - 8M0120837 - S\/N 0R042475 \u0026 Above","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 \u003cspan style=\"color: rgb(43, 0, 255);\"\u003e\u003ca href=\"https:\/\/partsvu.com\/collections\/blackstone-laboratories\" style=\"color: rgb(43, 0, 255);\"\u003eoil analysis kits\u003c\/a\u003e\u003c\/span\u003e. Results are typically received in a few days via email. \u003cspan style=\"color: rgb(43, 0, 255);\"\u003e\u003ca href=\"https:\/\/partsvu.com\/collections\/blackstone-laboratories\" style=\"color: rgb(43, 0, 255);\"\u003eShop now\u003c\/a\u003e\u003c\/span\u003e.\u003c\/p\u003e\n\u003ch2\u003eMercury | 300 Hour Service Kit | 8M0120837\u003c\/h2\u003e\n\u003cp\u003eStay on schedule with a complete 300 hour service kit for Mercury 8 HP and 9.9 HP carbureted (209cc) four-stroke outboards equipped with \u003cstrong\u003estandard gearcases\u003c\/strong\u003e. Built around \u003cstrong\u003e25W-40 synthetic blend four-stroke oil\u003c\/strong\u003e, this kit includes the core service items plus the cooling, ignition, and sealing components commonly addressed at the 300 hour interval. It is a simple way to refresh critical systems and keep your small outboard starting easily and running reliably.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e8 HP Carb (209cc) – Serial 0R042475 \u0026amp; up\u003c\/li\u003e\n\u003cli\u003e9.9 HP Carb (209cc) – Serial 0R042475 \u0026amp; up\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr style=\"margin: 24px 0;\"\u003e\n\u003ch3\u003eWhat’s Included in This Kit\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1x\u003c\/strong\u003e 25W-40 Synthetic Blend Four-Stroke Engine Oil (Quart)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1x\u003c\/strong\u003e Gear Lube (Quart)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1x\u003c\/strong\u003e Fuel Filter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1x\u003c\/strong\u003e Oil Drain Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2x\u003c\/strong\u003e Gearcase Drain Seals\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1x\u003c\/strong\u003e Thermostat\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1x\u003c\/strong\u003e Thermostat Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2x\u003c\/strong\u003e Spark Plugs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1x\u003c\/strong\u003e Water Impeller Kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1x\u003c\/strong\u003e Anode\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr style=\"margin: 24px 0;\"\u003e\n\u003ch3\u003eWhy This 300 Hour Service Kit Matters\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMilestone service coverage:\u003c\/strong\u003e Combines fluids, filter, seals, and wear items in one kit so nothing gets missed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCooling system refresh:\u003c\/strong\u003e Thermostat and impeller service helps support proper water flow and stable operating temperature.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReliable running:\u003c\/strong\u003e New spark plugs and fuel filtration support clean combustion and dependable starting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorrosion protection:\u003c\/strong\u003e Includes an anode to help reduce galvanic corrosion in marine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr style=\"margin: 24px 0;\"\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this kit fit EFI models?\u003c\/strong\u003e\u003cbr\u003eNo. This kit is intended for carbureted 209cc 8 HP and 9.9 HP four-stroke models only.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy are 2 gearcase drain seals included?\u003c\/strong\u003e\u003cbr\u003eMost gearcases use sealing washers at both the drain and vent screws. Replacing both helps ensure a proper seal after service.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I confirm this kit matches my outboard?\u003c\/strong\u003e\u003cbr\u003eVerify your engine is an 8 HP or 9.9 HP carbureted (209cc) model, falls within the listed serial range, and uses a standard gearcase before ordering.\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":47125895971107,"sku":"PVM00089","price":226.47,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/8m0120837_2540.jpg?v=1701377082","url":"https:\/\/partsvu.com\/en-ca\/products\/mercury-8-9-9-complete-300-hour-service-maintenance-kit-standard-gearcase-only-25w-40-synthetic-blend-8m0120837-s-n-0r042475-above","provider":"PartsVu","version":"1.0","type":"link"}