{"product_id":"red-line-mt-85-75w85-gl-4-manual-transmission-gear-oil-1-quart-4-pack-brass-safe-smooth-shifts","title":"Red Line MT-85 75W85 GL-4 Manual Transmission Gear Oil - 1 Quart (4 Pack) | Brass-Safe, Smooth Shifts","description":"\u003cp\u003e\u003cstrong\u003eRed Line MT-85 75W85 GL-4 is a high-performance manual transmission gear oil formulated to protect gears and synchros while improving shift quality across a wide range of manual applications.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis synthetic-based GL-4 gear lubricant is designed for drivers and technicians who need reliable protection for manual gearboxes, especially vehicles that require brass-safe formulations. It balances wear control and friction characteristics to help produce smoother shifts, longer component life, and dependable performance in varied temperatures.\u003c\/p\u003e\n\n\u003ch3\u003eHow does MT-85 protect gears and synchronizers?\u003c\/h3\u003e\n\u003cp\u003eMT-85 uses a balanced additive package and base oils that adhere to gear surfaces to reduce metal-to-metal contact and minimize wear. Its formulation provides controlled friction to preserve the life of bronze and brass synchros without the reactive sulfur compounds present in GL-5 fluids.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eGL-4 chemistry avoids corrosive sulfides that can damage brass synchros\u003c\/li\u003e\n  \u003cli\u003eAnti-wear additives reduce pitting and scoring under load\u003c\/li\u003e\n  \u003cli\u003eStable viscosity film maintains protection across temperature ranges\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this oil make shifting easier, especially in cold weather?\u003c\/h3\u003e\n\u003cp\u003eYes—MT-85’s viscosity and friction characteristics are tuned to reduce shift effort and provide smoother engagement when shifting from cold starts. It offers a slipperiness that helps synchros operate more efficiently without compromising gear protection.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e75W85 grade for balanced cold-flow and high-temperature film strength\u003c\/li\u003e\n  \u003cli\u003eFriction modifiers help quicker, crisper shifts\u003c\/li\u003e\n  \u003cli\u003eConsistent shift feel across a wide ambient temperature range\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich vehicles and applications is this GL-4 oil suited for?\u003c\/h3\u003e\n\u003cp\u003eMT-85 is broadly compatible with many manual transmissions calling for GL-1, GL-3, or GL-4 oils, and it’s commonly used in performance and OEM manual gearboxes that specify brass-safe fluids. It is often chosen for Japanese and some European manual cars where GL-5 would be inappropriate for bronze synchros.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCommon fitment: Nissan 350Z\/370Z and many Maxima, Altima, Sentra models\u003c\/li\u003e\n  \u003cli\u003eAlso suitable for select Mitsubishi Evolution, Hyundai, Kia transmissions\u003c\/li\u003e\n  \u003cli\u003eWorks with aftermarket units like Quaife that require GL-4-type lubricants\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does Red Line’s reputation and product quality matter here?\u003c\/h3\u003e\n\u003cp\u003eRed Line has a long history of specialty lubricants tailored for performance and longevity. Using a brand known for focused formulations helps ensure the product matches the expectations of enthusiasts and technicians seeking longevity and consistent performance.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDecades of formulation experience in racing and performance sectors\u003c\/li\u003e\n  \u003cli\u003eProducts engineered to protect high-stress mechanical components\u003c\/li\u003e\n  \u003cli\u003eQuality control and materials suited for demanding manual transmissions\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? MT-85 75W85 GL-4 is aimed at drivers, mechanics, and performance builders who need a brass-safe manual transmission oil that improves shift quality and guards internal components. It’s a strong choice for owners of manual-equipped Nissan 350Z\/370Z, many Maxima\/Altima\/Sentra models, Mitsubishi Evolution owners, and those running various Hyundai, Kia, and Quaife manual gearboxes. Choose this product if you want a proven, specialist lubricant that prioritizes synchro longevity and reliable shifting without resorting to typical GL-5 chemistries that can harm bronze parts.\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 MT-85 safe for brass synchros?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. MT-85 is a GL-4 formulation without reactive sulfurs, making it safe for brass and bronze synchros.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can this replace GL-5 oil?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Only if your gearbox requires GL-4 or similar—do not use MT-85 where GL-5 is specifically specified by the manufacturer.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Red Line","offers":[{"title":"Default Title","offer_id":67584973111481,"sku":"B00NQBFHVW","price":219.08,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/3765\/3177\/files\/red-line-mt-85-front-quart.jpg?v=1790461592","url":"https:\/\/redleafauto.ca\/products\/red-line-mt-85-75w85-gl-4-manual-transmission-gear-oil-1-quart-4-pack-brass-safe-smooth-shifts","provider":"Redleaf Auto","version":"1.0","type":"link"}