{"product_id":"sierra-18-7901-4-cycle-outboard-oil-filter","title":"Sierra 18-7901 4-Cycle Outboard Oil Filter – Mercury\/Mariner \u0026 Yamaha 8–9.9 HP","description":"\u003csection class=\"product-description\"\u003e\n\n\u003ch2\u003eSierra 18-7901 4-Cycle Outboard Oil Filter – Mercury\/Mariner \u0026amp; Yamaha 8–9.9 HP\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e 18-7901  |  \u003cstrong\u003eSKU:\u003c\/strong\u003e 47-7901  |  \u003cstrong\u003eUPC:\u003c\/strong\u003e 808282100827\u003c\/p\u003e\n\n\u003cp\u003eThe Sierra 18-7901 is a spin-on oil filter for selected Mercury\/Mariner and Yamaha 4-stroke outboard engines, primarily in the 8 HP and 9.9 HP range. It uses an M16 x 1.5 thread, heavy-wall steel canister with epoxy corrosion protection, and high-efficiency filter media that meets or exceeds OEM filtration requirements.\u003c\/p\u003e\n\n\u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eThread: M16 x 1.5\u003c\/li\u003e\n\u003cli\u003eFilter type: 4-cycle outboard spin-on oil filter\u003c\/li\u003e\n\u003cli\u003eCanister: Heavy-wall epoxy-coated steel\u003c\/li\u003e\n\u003cli\u003eFilter media: High-efficiency, meets or exceeds OEM specification\u003c\/li\u003e\n\u003cli\u003eMarine-duty construction for freshwater and saltwater environments\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatible Applications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eMercury\/Mariner 9.9 HP 4-stroke outboards, serial range 0H000058–0H017099 (1995–1998 applications)\u003c\/li\u003e\n\u003cli\u003eMercury\/Mariner 8 HP 4-stroke outboards — selected models (verify by serial number)\u003c\/li\u003e\n\u003cli\u003eMercury\/Mariner 9.9 HP 4-stroke outboards — other selected applications (verify by serial number)\u003c\/li\u003e\n\u003cli\u003eYamaha F9.9 4-stroke outboards, approximately 1990–2003 (6G8-series filter reference)\u003c\/li\u003e\n\u003cli\u003eYamaha T9.9 4-stroke outboards, approximately 1990–2003 (6G8-series filter reference)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eFitment Note:\u003c\/strong\u003e Confirm your engine model, model year, and serial number before ordering. The M16 x 1.5 thread and OEM cross-reference — Mercury 825467A1 or Yamaha 6G8-13440-00-00 — are the most reliable fitment identifiers for this filter.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch2\u003eService Interval\u003c\/h2\u003e\n\u003cp\u003eReplace at every scheduled engine oil service. Follow the outboard manufacturer’s recommended interval for your specific engine model — typically every 100 hours or once per season, whichever comes first.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eRemove the old filter and confirm the old gasket has come away with it — a retained gasket will cause an oil leak\u003c\/li\u003e\n\u003cli\u003eClean the filter mounting surface\u003c\/li\u003e\n\u003cli\u003eLightly coat the new filter gasket with fresh engine oil before threading it on\u003c\/li\u003e\n\u003cli\u003eTighten by hand plus ¾ turn, or per engine manufacturer specification — do not over-tighten\u003c\/li\u003e\n\u003cli\u003eRun the engine and inspect for leaks before returning to service\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eOEM \u0026amp; Cross-Reference Part Numbers\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSierra:\u003c\/strong\u003e 18-7901\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMercury:\u003c\/strong\u003e 825467A1, 825467T1, 825467T02\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eYamaha:\u003c\/strong\u003e 6G8-13440-00-00\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eRelated Products\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/sierra-18-7913-4-cycle-outboard-oil-filter-mercury-honda-47-7913\"\u003eSierra 18-7913 4-Cycle Outboard Oil Filter – Mercury \u0026amp; Honda\u003c\/a\u003e — Sierra filter for larger Mercury 4-stroke outboards\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/sierra-7902-4-cycle-outboard-oil-filter\"\u003eSierra 7902 4-Cycle Outboard Oil Filter\u003c\/a\u003e — Sierra filter for Yamaha 3FV\/3FC-series 4-stroke outboards\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/seachoice-50-21004-full-flow-oil-filter-20-micron\"\u003eSeachoice 50-21004 Full-Flow Oil Filter – 20 Micron\u003c\/a\u003e — Seachoice filter for Mercury 25–115 HP 4-stroke outboards\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/seachoice-50-21018-full-flow-oil-filter-20-micron\"\u003eSeachoice 50-21018 Full-Flow Oil Filter – 20 Micron\u003c\/a\u003e — Seachoice filter for Yamaha 3FV\/3FC-series 4-stroke outboards\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eParts Desk Insights\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eBest Use Case:\u003c\/strong\u003e Routine oil and filter changes on older Mercury\/Mariner 8 and 9.9 HP 4-stroke outboards from the mid-1990s through late-1990s, and on Yamaha F9.9 and T9.9 4-stroke outboards from 1990 through approximately 2003. This is a narrow-application filter covering older small-displacement 4-stroke outboards — useful for customers maintaining legacy engines that are still in service.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCommon Issues:\u003c\/strong\u003e Because this filter covers a specific serial number range on Mercury\/Mariner 9.9 HP engines, customers should confirm their serial number falls within the 0H000058–0H017099 range before ordering for Mercury applications. The M16 x 1.5 thread is a key differentiator from other small-outboard oil filters that look similar but use different thread specs. The fastest fitment check is matching Mercury 825467A1 or Yamaha 6G8-13440-00-00 to what is currently on the engine.\u003c\/p\u003e\n\n\u003c\/section\u003e","brand":"LNS","offers":[{"title":"Default Title","offer_id":51199650496548,"sku":"47-7901","price":37.69,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/images_c57df8f1-7fc0-4629-b45c-95742b42d648.jpg?v=1788154512","url":"https:\/\/marisolmarine.com\/products\/sierra-18-7901-4-cycle-outboard-oil-filter","provider":"Marisol Marine Company","version":"1.0","type":"link"}