{"product_id":"red-line-mt-85-75w85-gl-4-gear-oil-1-quart-4-pack-synthetic-blend-brass-safe-for-smoother-shifts","title":"Red Line MT-85 75W85 GL-4 Gear Oil 1-Quart 4-Pack — Synthetic Blend, Brass-Safe for Smoother 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 brass synchros while delivering smoother, quicker shifts in a wide range of passenger and performance cars.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis quart-sized, four-pack of Red Line MT-85 (part number 50504) is a synthetic blend gear lubricant designed for GL-1, GL-3 and GL-4 applications where controlled friction and compatibility with brass synchros are essential. MT-85 balances wear protection and the correct frictional characteristics to help preserve synchros, extend gearbox life and improve shift feel, especially in cold starts. It’s commonly used in a variety of manually shifted vehicles including Nissan, Mitsubishi, Hyundai, Kia and Quaife-equipped gearboxes.\u003c\/p\u003e\n\n\u003ch3\u003eHow does MT-85 improve shifting performance?\u003c\/h3\u003e\n\u003cp\u003eMT-85 is tuned to provide controlled slipperiness so synchronizers engage smoothly without being over-lubricated. That balance reduces grinding and makes shifts feel shorter and more precise, particularly during cold-weather operation when many oils thicken and slow synchromesh action.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFormulated friction characteristics for reliable synchro engagement\u003c\/li\u003e\n  \u003cli\u003eMaintains shift quality across broad temperatures\u003c\/li\u003e\n  \u003cli\u003eHelps reduce shift effort and false neutrals in performance use\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIs this safe for brass synchros and older transmissions?\u003c\/h3\u003e\n\u003cp\u003eYes — MT-85 is a GL-4 rated gear oil that avoids the corrosive reactive sulfur compounds found in typical GL-5 formulations. That makes it safe for brass and bronze synchros and suitable for many older transmissions that require milder gear oils.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eGL-4 chemistry protects non-ferrous synchro materials\u003c\/li\u003e\n  \u003cli\u003eRecommended where GL-1, GL-3 or GL-4 is specified\u003c\/li\u003e\n  \u003cli\u003eReduces risk of brass wear compared with GL-5 in sensitive gearsets\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich vehicles and applications commonly use MT-85?\u003c\/h3\u003e\n\u003cp\u003eMT-85 is popular among drivers of both factory and modified manual-transmission cars. It is frequently specified or chosen for Nissan 350Z\/370Z and many Maxima, Altima and Sentra models, Mitsubishi Evolution transmissions, and a range of Hyundai and Kia gearboxes, as well as custom Quaife differential and synchro setups.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCommon fitment: Nissan 350Z, 370Z, Maxima, Altima, Sentra\u003c\/li\u003e\n  \u003cli\u003eAlso used in Mitsubishi Evo and several Hyundai\/Kia manuals\u003c\/li\u003e\n  \u003cli\u003eCompatible with Quaife and other aftermarket synchro\/differential systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does MT-85 protect gears and extend component life?\u003c\/h3\u003e\n\u003cp\u003eThe formulation offers robust wear protection while preserving the frictional balance needed for synchronizers. By limiting metal-to-metal contact and resisting shearing and thermal breakdown, MT-85 helps prolong the life of gears, bearings and synchros under both street and spirited driving conditions.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eHigh-performance additives reduce wear and scuffing\u003c\/li\u003e\n  \u003cli\u003eStable viscosity under heat preserves film strength\u003c\/li\u003e\n  \u003cli\u003eHelps maintain synchro life and consistent shift feel over time\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? Drivers and technicians who need a reliable, synchro-friendly manual transmission oil that combines protection with predictable shift behavior will appreciate Red Line MT-85. It’s aimed at owners of compatibility-sensitive gearboxes — from daily-driven Nissans and Hyundais to performance-oriented Mitsubishis and Quaife-equipped builds — and for anyone replacing fluids in transmissions that call for GL-1, GL-3 or GL-4 specifications. Packaged as a convenient one-quart bottle and sold in a four-pack, this product is practical for single-service jobs or keeping spare fluid on hand for regular maintenance and track-day prep.\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 MT-85 replace GL-5 oil in my manual gearbox?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: MT-85 is GL-4 and safer for brass synchros; it can replace GL-5 only if your gearbox requires GL-4 or specifies MT-85—check the manufacturer recommendation first.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is 75W85 suitable for cold-weather shifting?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The 75W viscosity helps maintain easier shifting during cold starts while preserving protection as temperatures rise.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Red Line","offers":[{"title":"Default Title","offer_id":48080238117022,"sku":"B00NQBFHVW","price":126.19,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/red-line-mt85-front-package.jpg?v=1785780003","url":"https:\/\/northtrailauto.ca\/products\/red-line-mt-85-75w85-gl-4-gear-oil-1-quart-4-pack-synthetic-blend-brass-safe-for-smoother-shifts","provider":"North Trail Auto","version":"1.0","type":"link"}