{"product_id":"royal-purple-max-gear-75w-90-gear-oil-set-of-3-1-quart-bottles-synthetic-gl-5-gl-4-with-synerlec","title":"Royal Purple Max Gear 75W-90 Gear Oil Set of 3 — 1-Quart Bottles, Synthetic GL‑5\/GL‑4 with Synerlec","description":"\u003cp\u003e\u003cstrong\u003eRoyal Purple Max Gear 75W-90 is a high-performance hypoid gear oil sold as a set of three 1‑quart bottles, engineered to protect heavily loaded differentials and manual transmissions while improving driveline efficiency.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eDesigned for automotive and marine applications that call for API GL‑5 or GL‑4 gear oils, Max Gear blends premium synthetic base stocks with Royal Purple’s Synerlec additive technology. The formula resists corrosion to soft yellow metals, is synchronizer safe for transmissions, and is intended to reduce friction, lower operating temperatures, and extend the life of gears and bearings in severe service conditions.\u003c\/p\u003e\n\n\u003ch3\u003eWhat makes Max Gear 75W‑90 suitable for heavy‑duty differentials?\u003c\/h3\u003e\n\n\u003cp\u003eMax Gear was formulated to withstand high loads and shock loading in hypoid gears, typical of truck rear differentials and heavy-duty drive systems. Its additive package supplies film strength and antiwear performance where pressure and heat are concentrated.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eAPI GL‑5\/GL‑4 compatibility for common gearboxes and differentials\u003c\/li\u003e\n  \u003cli\u003eSynerlec friction modifier for smoother engagement and reduced wear\u003c\/li\u003e\n  \u003cli\u003eThermally stable synthetic base oils for consistent viscosity under stress\u003c\/li\u003e\n  \u003cli\u003eRapid water separation to maintain protection in wet conditions\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does this oil help driveline efficiency and heat management?\u003c\/h3\u003e\n\n\u003cp\u003eBy lowering internal friction and maintaining a protective film at high loads, Max Gear reduces the drag in the drivetrain that can sap horsepower. Reduced friction and improved heat rejection help components run cooler and preserve lubricant life under severe duty cycles.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eLower coefficient of friction for reduced parasitic loss\u003c\/li\u003e\n  \u003cli\u003eReduced operating temperatures under continuous or heavy loads\u003c\/li\u003e\n  \u003cli\u003eImproved horsepower transfer for marginal fuel economy gains\u003c\/li\u003e\n  \u003cli\u003eStable viscosity retention across typical operating ranges\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIs Max Gear safe for my transmission, differential components, and marine lower units?\u003c\/h3\u003e\n\n\u003cp\u003eMax Gear is non‑corrosive to soft yellow metals like brass, bronze, and copper and is formulated to be synchronizer safe, making it appropriate for many manual transmissions and limited‑slip differentials. It also meets the needs of marine lower gear cases where GL‑5 or GL‑4 fluids are specified.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eNon‑corrosive to brass, bronze, and copper components\u003c\/li\u003e\n  \u003cli\u003eFormulated for limited‑slip differential use without extra additives\u003c\/li\u003e\n  \u003cli\u003eSynchronizer safe for compatible manual gearboxes\u003c\/li\u003e\n  \u003cli\u003eSuitable for certain marine lower gear units that require GL‑5\/GL‑4\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow much product do I get and what are practical benefits to expect?\u003c\/h3\u003e\n\n\u003cp\u003eThis listing is a case of three 1‑quart (32‑ounce) bottles, convenient for servicing multiple axles or keeping spares on hand. Users typically notice quieter gear operation, reduced component temperatures, and extended gear and bearing life when changing from conventional oils to a modern synthetic-based formulation like Max Gear.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eCase contains 3 x 1‑quart (32 oz) bottles for multiple services\u003c\/li\u003e\n  \u003cli\u003eProduces smoother, quieter gear engagement with friction modifier\u003c\/li\u003e\n  \u003cli\u003eHelps extend maintenance intervals by protecting bearings and gears\u003c\/li\u003e\n  \u003cli\u003eSeparates rapidly from water to restore lubrication after contamination\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: Royal Purple Max Gear 75W‑90 is aimed at vehicle owners, fleet managers, off‑roaders, and marine operators who need a robust hypoid gear oil for heavy loads, severe service, or performance‑oriented drivetrains. It is well suited to trucks, SUVs, 4x4s, manual transmissions, and certain marine lower gear units that specify API GL‑5 or GL‑4 fluids and require non‑corrosive, synchronizer‑safe lubrication.\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 Max Gear 75W‑90 in limited‑slip differentials?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. Max Gear is formulated for limited‑slip differential use and includes a friction modifier so no additional additives are typically required.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is this product safe for brass and copper components?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The formula is non‑corrosive to soft yellow metals such as brass, bronze, and copper.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Royal Purple","offers":[{"title":"Default Title","offer_id":48079834054814,"sku":"B074WC7XSD","price":83.84,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/royal-purple-max-gear-front-quart.jpg?v=1785772130","url":"https:\/\/northtrailauto.ca\/products\/royal-purple-max-gear-75w-90-gear-oil-set-of-3-1-quart-bottles-synthetic-gl-5-gl-4-with-synerlec","provider":"North Trail Auto","version":"1.0","type":"link"}