{"product_id":"mercury-10w-30-marine-engine-oil-quart-4-stroke-mineral-fc-w-catalyst-compatible-corrosion-protection","title":"MERCURY 10W-30 Marine Engine Oil Quart — 4-Stroke Mineral, FC-W Catalyst Compatible, Corrosion Protection","description":"\u003cp\u003e\u003cstrong\u003eMercury 10W-30 4-Stroke Mineral Marine Engine Oil (1 quart) is a mineral-based engine lubricant formulated to protect four-stroke marine engines from wear and corrosion both on and off the water.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eBoats operate in salty, humid and high-load environments that demand oils different from automotive formulations. This Mercury 10W-30 marine oil uses a mineral base plus a targeted additive package to meet marine industry standards, provide reliable viscosity retention and remain compatible with catalytic systems. It’s made by Mercury Marine to the original equipment specifications so it fits warranty and performance expectations when 10W-30 is specified.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this oil protect my marine engine during storage and use?\u003c\/h3\u003e\n\u003cp\u003eThe additive chemistry in this formula helps inhibit rust and corrosion that can form when engines sit unused or run in corrosive conditions. Viscosity and film strength are preserved to reduce metal-on-metal wear during startup and prolonged operation.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCorrosion inhibitors guard internal parts when boat is idle\u003c\/li\u003e\n  \u003cli\u003eViscosity retention supports stable oil film under load\u003c\/li\u003e\n  \u003cli\u003eWear-reducing additives extend component life\u003c\/li\u003e\n  \u003cli\u003eMineral base specifically balanced for marine environments\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIs this oil compatible with catalytic converters and marine warranty requirements?\u003c\/h3\u003e\n\u003cp\u003eThis Mercury 10W-30 meets marine industry certifications and is labeled FC-W and FC-W Catalyst Compatible, meaning it is suitable for engines requiring those approvals. It is formulated to satisfy manufacturer recommendations for four-stroke marine engines where 10W-30 is called for.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFC-W certified for marine four-stroke engines\u003c\/li\u003e\n  \u003cli\u003eCompatible with catalytic systems when specified\u003c\/li\u003e\n  \u003cli\u003eMeets OEM warranty and specification requirements\u003c\/li\u003e\n  \u003cli\u003eProduced to Mercury Marine equipment standards\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat performance can I expect compared to generic or automotive oils?\u003c\/h3\u003e\n\u003cp\u003eMarine-specific oils are designed to resist the unique stresses of boating—salt air, variable loads and long idle periods—that automotive oils are not optimized for. This mineral marine oil emphasizes corrosion protection and viscosity stability to perform reliably in marine duty cycles.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFormulated for marine thermal and load conditions\u003c\/li\u003e\n  \u003cli\u003eImproved corrosion resistance versus automotive oils\u003c\/li\u003e\n  \u003cli\u003eMaintains protective film during extended idling and throttle changes\u003c\/li\u003e\n  \u003cli\u003eBacked by Mercury’s marine engineering and testing\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow should I use and store this 1-quart bottle for best results?\u003c\/h3\u003e\n\u003cp\u003eUse this quart for scheduled oil changes or as a top-off following the engine manufacturer’s service intervals. Store sealed and upright in a cool, dry place away from direct sunlight to preserve additive effectiveness and shelf life.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFollow engine manual for oil capacity and change intervals\u003c\/li\u003e\n  \u003cli\u003eDispose of used oil responsibly per local regulations\u003c\/li\u003e\n  \u003cli\u003eKeep bottle sealed until use; store in a cool, dry place\u003c\/li\u003e\n  \u003cli\u003eUse when 10W-30 is specified by the engine maker\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: Boat owners, professional mariners and maintenance technicians who run four-stroke outboard or sterndrive engines calling for 10W-30 and who want a manufacturer-produced mineral oil that meets marine certifications. It’s especially suitable for users seeking a cost-effective, warranty-compliant lubricant that prioritizes corrosion resistance and dependable viscosity control for recreational and light commercial boating.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I use this oil in any four-stroke marine engine?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, when the engine manufacturer calls for 10W-30. It meets FC-W and FC-W Catalyst Compatibility and OEM requirements.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is this oil suitable for engines with catalytic converters?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. This Mercury 10W-30 is labeled FC-W Catalyst Compatible for use where catalysts are present.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"MERCURY","offers":[{"title":"Default Title","offer_id":55165601907031,"sku":"B00HURPZDS","price":35.09,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/mercury-front-quart.jpg?v=1790356166","url":"https:\/\/britishgarage.co.uk\/products\/mercury-10w-30-marine-engine-oil-quart-4-stroke-mineral-fc-w-catalyst-compatible-corrosion-protection","provider":"British Garage","version":"1.0","type":"link"}