{"product_id":"seachoice-50-21001-full-flow-oil-filter-20-micron","title":"Seachoice 50-21001 Full-Flow Oil Filter – 20 Micron | MerCruiser, Volvo Penta \u0026 OMC","description":"\u003csection class=\"product-description\"\u003e\n\n\u003ch2\u003eSeachoice 50-21001 Full-Flow Oil Filter – 20 Micron\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e 50-21001  |  \u003cstrong\u003eSKU:\u003c\/strong\u003e 50-21001  |  \u003cstrong\u003eUPC:\u003c\/strong\u003e 719249210100\u003c\/p\u003e\n\n\u003cp\u003eThe Seachoice 50-21001 is a 20-micron full-flow spin-on marine oil filter for a wide range of MerCruiser, Mercury, OMC, Volvo Penta, Crusader, Chris-Craft, and Yamaha sterndrive applications. It crosses directly to Sierra 18-7824-2 and several OEM filter numbers. Built with high-efficiency cellulose filter media, an epoxy-coated canister, reinforced body construction, heavy-duty end-cap seals, and an anti-drain-back valve, it meets or exceeds original equipment filtration requirements.\u003c\/p\u003e\n\n\u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eFiltration: 20 micron\u003c\/li\u003e\n\u003cli\u003eFilter type: Full-flow spin-on\u003c\/li\u003e\n\u003cli\u003eFilter media: High-efficiency cellulose\u003c\/li\u003e\n\u003cli\u003eAnti-drain-back valve: Yes\u003c\/li\u003e\n\u003cli\u003eCanister: Epoxy-coated steel for corrosion resistance\u003c\/li\u003e\n\u003cli\u003eBody: Reinforced construction\u003c\/li\u003e\n\u003cli\u003eEnd-cap seals: Heavy-duty\u003c\/li\u003e\n\u003cli\u003eManufactured in an ISO\/TS 16949 certified facility\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatible Applications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eMerCruiser sterndrive engines specifying filter 35-802885Q, 32716, or 866340K01\u003c\/li\u003e\n\u003cli\u003eMercury sterndrive engines specifying filter 35-866340K01\u003c\/li\u003e\n\u003cli\u003eOMC sterndrive applications specifying filter 502902\u003c\/li\u003e\n\u003cli\u003eVolvo Penta sterndrive engines specifying filter 835440-9\u003c\/li\u003e\n\u003cli\u003eCrusader inboard engines specifying filter 201104\u003c\/li\u003e\n\u003cli\u003eChris-Craft inboard engines specifying filter 16.81-08746\u003c\/li\u003e\n\u003cli\u003eYamaha sterndrive applications specifying filter YSC-10231-20-0C\u003c\/li\u003e\n\u003cli\u003eApplications cross-referencing Sierra 18-7824-2\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eFitment Note:\u003c\/strong\u003e Similar GM-based marine engines can use different short, long, or remote-mounted oil filter configurations. Always confirm your existing filter part number before ordering — matching an OEM cross-reference is more reliable than matching by appearance alone.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch2\u003eService Interval\u003c\/h2\u003e\n\u003cp\u003eReplace at every engine oil change, following the engine manufacturer’s recommended service interval — typically every 100 hours of operation 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\u003eCross-Reference Part Numbers\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeachoice:\u003c\/strong\u003e 50-21001 \/ 21001\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSierra:\u003c\/strong\u003e 18-7824-2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMerCruiser:\u003c\/strong\u003e 35-802885Q, 32716\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMerCruiser \/ Mercury:\u003c\/strong\u003e 866340K01 \/ 35-866340K01\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOMC:\u003c\/strong\u003e 502902\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVolvo Penta:\u003c\/strong\u003e 835440-9\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eYamaha Sterndrive:\u003c\/strong\u003e YSC-10231-20-0C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChris-Craft:\u003c\/strong\u003e 16.81-08746\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrusader:\u003c\/strong\u003e 201104\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-18-7824-2-marine-oil-filter-gm-mercruiser-volvo-penta-omc-crusader-indmar\"\u003eSierra 18-7824-2 Marine Oil Filter – GM MerCruiser, Volvo Penta, OMC, Crusader \u0026amp; Indmar\u003c\/a\u003e — OEM-equivalent this filter replaces\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/seachoice-50-21011-full-flow-oil-filter-20-micron\"\u003eSeachoice 50-21011 Full-Flow Oil Filter – 20 Micron\u003c\/a\u003e — Mercury \u0026amp; Yamaha outboard application\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 — alternate Seachoice marine filter\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/mallory-9-57825-marine-oil-filter-gm-mercruiser-crusader-omc\"\u003eMallory 9-57825 Marine Oil Filter – GM MerCruiser, Crusader \u0026amp; OMC\u003c\/a\u003e\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 MerCruiser and Mercury sterndrive engines, as well as OMC, Volvo Penta, Yamaha, Chris-Craft, and Crusader inboard applications. This is one of the most widely used filters for inboard and sterndrive boats — the Sierra 18-7824-2 cross-reference covers a broad swath of GM-based marine engine installations, making this a high-velocity maintenance stock item.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCommon Issues:\u003c\/strong\u003e The most frequent ordering error is selecting the wrong GM marine filter style — similar-looking engines may use short-canister, long-canister, or remote-mount filter arrangements. Always confirm the existing filter’s part number first. Matching the Sierra 18-7824-2 or one of the listed OEM numbers is the fastest and most reliable way to confirm the correct filter for the application.\u003c\/p\u003e\n\n\u003c\/section\u003e","brand":"LNS","offers":[{"title":"Default Title","offer_id":51199649316900,"sku":"50-21001","price":15.29,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/50-21017_Main_d1c17497-36f0-44a7-afd6-f58e5ebd7644.jpg?v=1785611147","url":"https:\/\/marisolmarine.com\/products\/seachoice-50-21001-full-flow-oil-filter-20-micron","provider":"Marisol Marine Company","version":"1.0","type":"link"}