{"product_id":"red-line-75w-90-gl-5-synthetic-gear-oil-1-qt-2-pack-hypoid-lsd-friendly-high-temp-protection","title":"Red Line 75W-90 GL-5 Synthetic Gear Oil 1 qt (2-Pack) — Hypoid LSD Friendly, High-Temp Protection","description":"\u003cp\u003e\u003cstrong\u003eRed Line 75W90 GL-5 synthetic gear oil is a high-performance hypoid differential lubricant formulated with built-in friction modifiers for clutch-type limited slip differentials, sold here as two 1-quart bottles.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis fully synthetic gear oil is engineered for hypoid gearsets found in many passenger cars, light trucks and race vehicles. It meets GL-5 performance standards and carries additional approvals and specifications that make it a suitable drop-in substitute for SAE 90 or 80W90 differentials. Because it contains extra friction modifiers, it’s ready for many clutch-type limited slip (LSD) units without separate additives, while offering thermal stability and wear protection under heavy loads.\u003c\/p\u003e\n\n\u003ch3\u003eWhat makes this gear oil suitable for hypoid differentials?\u003c\/h3\u003e\n\u003cp\u003eThe base oil chemistry and additive package are optimized for the sliding and rolling contact stresses of hypoid gears. A GL-5 rating indicates the formulation provides extreme pressure protection, while the synthetic base promotes temperature stability and reduced volatility.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eExtreme-pressure additives to resist gear scuffing and scoring\u003c\/li\u003e\n  \u003cli\u003eSynthetic base oils for consistent viscosity at high temperatures\u003c\/li\u003e\n  \u003cli\u003eImproved shear stability to maintain film strength under load\u003c\/li\u003e\n  \u003cli\u003eMeets multiple industry specifications for broad compatibility\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this oil work with limited slip differentials?\u003c\/h3\u003e\n\u003cp\u003eThis Red Line product includes friction-modifying ingredients intended for many clutch-type limited slip differentials, eliminating the need for separate friction additives in most applications. Always check the vehicle manufacturer’s guidance; a few LSD designs require specific additive types.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eBuilt-in friction modifiers for many clutch-type LSDs\u003c\/li\u003e\n  \u003cli\u003eSaves time compared with adding aftermarket LSD fluid\u003c\/li\u003e\n  \u003cli\u003eCompatible with most service intervals where GL-5 oils are specified\u003c\/li\u003e\n  \u003cli\u003eVerify OEM recommendations for unique LSD systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCan I use this oil in my transmission or transaxle?\u003c\/h3\u003e\n\u003cp\u003eThis formulation is designed specifically for differentials and hypoid gear sets. Its high level of slipperiness may interfere with synchronizer function in many manual transmissions and transaxles, so it is generally not recommended for those applications.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eNot recommended for most manual transmissions or transaxles\u003c\/li\u003e\n  \u003cli\u003eMay cause shifting problems if used where synchronizers need higher friction\u003c\/li\u003e\n  \u003cli\u003eIntended primarily for rear and front differentials with hypoid gears\u003c\/li\u003e\n  \u003cli\u003eCheck vehicle service manual before alternative uses\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich specifications and vehicle types is this oil compatible with?\u003c\/h3\u003e\n\u003cp\u003eThe oil meets several industry and military specs as well as Chrysler MS-9763, making it a versatile option for many cars, trucks and racing applications. It is commonly used as a replacement for conventional 80W90 or SAE 90 fluids when GL-5 protection and synthetic performance are desired.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAPI GL-5 level protection for extreme pressure environments\u003c\/li\u003e\n  \u003cli\u003eApproved against specifications like GL-6, MT-1 and MIL-L-2105E where applicable\u003c\/li\u003e\n  \u003cli\u003eSuitable as an upgrade from conventional 80W90\/SAE 90 oils\u003c\/li\u003e\n  \u003cli\u003ePopular with performance, racing and heavy-duty automotive differentials\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: This product is aimed at car and light-truck owners, performance enthusiasts and mechanics who need a robust, synthetic gear oil for hypoid differentials—especially when clutch-type limited slip compatibility is desired without adding separate friction modifiers. It’s also a good choice for anyone seeking better thermal and load-carrying performance than conventional 80W90 oils, provided the vehicle’s service manual allows GL-5 synthetic lubricants.\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: Is additional friction modifier required for limited slip differentials?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Usually no—this Red Line 75W90 contains friction modifiers suitable for most clutch-type LSDs, but verify OEM recommendations for your specific unit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I use this oil in manual transmissions?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No. Its slipperiness may harm synchronizers; it’s formulated for differentials, not most manual transmissions or transaxles.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Red Line","offers":[{"title":"Default Title","offer_id":48081350295710,"sku":"B0BN72C456","price":65.61,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/red-line-75w90-front-packaging.jpg?v=1785800280","url":"https:\/\/northtrailauto.ca\/products\/red-line-75w-90-gl-5-synthetic-gear-oil-1-qt-2-pack-hypoid-lsd-friendly-high-temp-protection","provider":"North Trail Auto","version":"1.0","type":"link"}