{"product_id":"sierra-18-7921-marine-oil-filter-replaces-mercury-35-877767k01-fits-135-150-175-200-hp-verado-in-line-4-outboards","title":"Sierra 18-7921 Oil Filter, Replaces Mercury 35-877767K01, Fits 135-200 HP Verado L4 Outboards","description":"\u003cp\u003eThe Sierra 18-7921 is a spin-on oil filter engineered for Mercury Verado L4 outboards, providing high-efficiency filtration to protect the engine's oil system during operation. Built with a heavy-wall steel canister and epoxy coating, the filter resists corrosion in the marine environment while standing up to the pressures of regular engine cycling. An integrated anti-drain-back valve keeps oil in the filter between starts, reducing dry-start wear and helping maintain steady oil pressure at ignition.\u003c\/p\u003e\u003cp\u003eFilter media is manufactured to meet or exceed OE filtration standards, capturing contaminants that would otherwise circulate through the engine and accelerate wear on bearings and moving parts. The filter uses a 24mm x 1.5 thread spec and is designed as a direct fit for Mercury Verado L4 outboards across the 135, 150, 175, and 200 HP range. It replaces Mercury part number 35-877767K01, making it a straightforward drop-in replacement during scheduled oil changes or maintenance service.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-7921\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Oil Filter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Spec:\u003c\/strong\u003e 24mm x 1.5\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions:\u003c\/strong\u003e 4 x 3.25 x 3.25 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.75 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFeatures:\u003c\/strong\u003e Anti-drain-back valve, epoxy coated, high-efficiency filter media\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercury Verado L4 135 HP, 2006-2011\u003c\/li\u003e\n\u003cli\u003eMercury Verado L4 150 HP, 2006-2011\u003c\/li\u003e\n\u003cli\u003eMercury Verado L4 175 HP, 2006-2011\u003c\/li\u003e\n\u003cli\u003eMercury Verado L4 200 HP, 2007-2011\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercury 35-877767K01\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-7921 oil filter fit?\u003c\/strong\u003e The Sierra 18-7921 fits Mercury Verado L4 outboards in the 135, 150, and 175 HP range for 2006-2011, and the 200 HP Verado L4 for 2007-2011.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does the 18-7921 replace?\u003c\/strong\u003e It replaces Mercury part number 35-877767K01, making the Sierra 18-7921 a direct equivalent for Verado L4 outboard oil changes.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the thread size on this oil filter?\u003c\/strong\u003e The Sierra 18-7921 uses a 24mm x 1.5 thread spec, matching the fitting on Mercury Verado L4 outboards.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the filter canister made from?\u003c\/strong\u003e Steel construction with an epoxy coating gives the 18-7921 canister added corrosion resistance for marine use.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this filter have an anti-drain-back valve?\u003c\/strong\u003e Yes, the 18-7921 includes an anti-drain-back valve that keeps oil in the filter between engine starts, reducing dry-start wear.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-7921 oil filter weigh?\u003c\/strong\u003e It weighs 0.75 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-7921 filter?\u003c\/strong\u003e The filter measures 4 x 3.25 x 3.25 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-7921 genuine Sierra or aftermarket?\u003c\/strong\u003e The 18-7921 is a genuine Sierra-manufactured part, built as a direct replacement for the Mercury OEM filter rather than a generic aftermarket copy.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the filtration meet OE standards?\u003c\/strong\u003e The 18-7921 uses high-efficiency filter media that meets or exceeds OE filtration performance for Mercury Verado L4 outboards.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-7921 fit a Verado L6 outboard?\u003c\/strong\u003e No, the 18-7921 is designed for Verado L4 models; Verado L6 outboards use a different Sierra filter part number.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988390785243,"sku":"SIE-18-7921","price":9.3,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-7921_lg__02106.1558133176.500.750.jpg?v=1785188978","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-7921-marine-oil-filter-replaces-mercury-35-877767k01-fits-135-150-175-200-hp-verado-in-line-4-outboards","provider":"Good Vibes Marina","version":"1.0","type":"link"}