{"product_id":"quicksilver-80w-90-marine-gear-lube-32-oz-premium-lower-unit-oil-corrosion-water-protection","title":"Quicksilver 80W-90 Marine Gear Lube 32 oz — Premium lower-unit oil, corrosion \u0026 water protection","description":"\u003cp\u003e\u003cstrong\u003eQuicksilver 80W-90 Premium Gear Lube is a 32 oz marine lower-unit oil formulated to protect outboard gear cases (under 75 hp) from wear, corrosion and water-related damage.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eMarine lower units operate in a harsh, wet environment where contamination, salt, and water intrusion can accelerate wear. This Quicksilver 80W-90 formulation is engineered to meet Mercury Marine OEM specs and provide durable, long-lasting lubrication for outboard motors and gear housings. Sold in 32 oz bottles (pack of 6), it’s designed as a direct replacement for Mercury part 858058K01 and focused on preventing pitting, corrosion, and gear failure when moisture gets into the case.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this gear lube protect gears when water gets into the lower unit?\u003c\/h3\u003e\n\u003cp\u003eThe formula includes additives that strengthen film integrity and resist water-induced breakdown, so metal-to-metal contact is minimized even after water exposure. That reduces pitting and corrosion, which are common causes of premature gear failure in marine environments.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSpecial corrosion inhibitors to neutralize salt and fresh water effects\u003c\/li\u003e\n  \u003cli\u003eAnti-wear agents that maintain smooth gear operation under load\u003c\/li\u003e\n  \u003cli\u003eStable viscosity that resists dilution and mechanical shear\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIs this oil compatible with my Mercury outboard or other brands under 75 hp?\u003c\/h3\u003e\n\u003cp\u003eThis Quicksilver gear lube is produced to Mercury Marine OEM specifications and is a recommended direct substitute for Mercury part 858058K01. It is intended for use in outboard lower units and gear cases rated below 75 hp but is also suitable for many other marine lower units with the same viscosity and performance needs.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e80W-90 viscosity — suitable for a wide range of lower unit tolerances\u003c\/li\u003e\n  \u003cli\u003eRecommended specifically for engines and gear cases under 75 hp\u003c\/li\u003e\n  \u003cli\u003eOEM-level formulation ensures fit for Mercury and many compatible systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow often should I change my lower unit oil with this product?\u003c\/h3\u003e\n\u003cp\u003eChange intervals depend on usage, water conditions, and manufacturer guidance, but inspecting and replacing lower unit oil at least once per season or after water intrusion is a common practice. If you detect water (milky oil), metallic particles, or a strong burnished odor, replace the lubricant immediately.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eStandard recommendation: annual or seasonal inspection and change\u003c\/li\u003e\n  \u003cli\u003eAfterwater contamination: drain and replace immediately\u003c\/li\u003e\n  \u003cli\u003eKeep a spare 32 oz bottle aboard for emergency top-offs or repairs\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat practical benefits will I notice using Quicksilver 80W-90 in my boat?\u003c\/h3\u003e\n\u003cp\u003eUsing this premium gear lube reduces gear noise, helps maintain smooth shifting, and extends the service life of the lower unit by resisting wear and corrosion. The product’s OEM-grade chemistry also reduces the chance of unexpected failures and makes maintenance straightforward for owners and technicians.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eQuieter, smoother gear engagement and operation\u003c\/li\u003e\n  \u003cli\u003eImproved resistance to pitting, especially in saltwater conditions\u003c\/li\u003e\n  \u003cli\u003eOEM-quality protection aligning with Mercury Marine specifications\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? Boaters, mechanics, and fleet operators who run outboard motors below 75 hp and want OEM-grade protection for their lower units will benefit from Quicksilver 80W-90 Premium Gear Lube. It’s a practical choice for recreational boat owners, service shops, and anyone seeking a direct replacement for Mercury part 858058K01 to reduce wear, prevent corrosion, and guard against the effects of water contamination.\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 80W-90 gear lube in fresh and saltwater boats?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The formula includes corrosion inhibitors suited for both fresh and saltwater lower units.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is this the correct replacement for Mercury part 858058K01?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. This Quicksilver product is a direct replacement manufactured to Mercury OEM specifications.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Quicksilver","offers":[{"title":"Default Title","offer_id":55166884315479,"sku":"B0039001TI","price":35.09,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/quicksilver-80w90-front-bottle.jpg?v=1790372544","url":"https:\/\/britishgarage.co.uk\/products\/quicksilver-80w-90-marine-gear-lube-32-oz-premium-lower-unit-oil-corrosion-water-protection","provider":"British Garage","version":"1.0","type":"link"}