{"product_id":"red-line-mt-85-75w-85-gl-4-manual-transmission-gear-oil-1-quart-synchro-safe-protection","title":"Red Line MT-85 75W-85 GL-4 Manual Transmission Gear Oil — 1 Quart, Synchro-Safe Protection","description":"\u003cp\u003e\u003cstrong\u003eRed Line 50504 MT-85 is a 75W-85 GL-4-rated manual transmission gear oil formulated to protect gears and synchromesh while promoting smooth, quick shifts.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eDesigned for performance-oriented and everyday manual transmissions, this 1-quart bottle of Red Line MT-85 targets vehicles that require GL-4 friction characteristics and brass-safe lubrication. It delivers long-lasting gear protection, helps preserve synchro life, and provides consistent shifting feel even in cooler conditions. MT-85 is widely recommended across various makes, 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 balances friction and lubricity to minimize harsh engagement and reduce shift effort. Its formulation keeps synchromesh surfaces functioning smoothly so you get crisper, more predictable gear changes, especially during cold starts.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e75W-85 viscosity for reliable cold-start shiftability\u003c\/li\u003e\n  \u003cli\u003eControlled friction profile to protect and assist synchromesh\u003c\/li\u003e\n  \u003cli\u003eStable film strength under load to prevent gear wear\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIs this safe for transmissions with brass synchronizers?\u003c\/h3\u003e\n\u003cp\u003eYes—MT-85 is a GL-4-rated oil that avoids the reactive sulfur compounds found in many GL-5 formulations, which can damage brass and bronze synchros. That makes it suitable where manufacturers specify GL-1, GL-3, or GL-4 fluids, and where special synchromesh lubricants are required.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eGL-4 chemistry safe for brass and bronze synchros\u003c\/li\u003e\n  \u003cli\u003eRecommended where special synchromesh fluids are called for\u003c\/li\u003e\n  \u003cli\u003eReduces synchro wear for extended component life\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 in a wide range of manual transmissions: from Nissan sports cars like the 350Z\/370Z to family sedans and performance boxes in Mitsubishi, Hyundai, Kia, and Quaife-equipped gearsets. It’s a practical choice for enthusiasts upgrading fluids and for routine service when GL-4 is specified.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eNissan 350Z and 370Z manuals; many Maxima, Altima, Sentra gearboxes\u003c\/li\u003e\n  \u003cli\u003eMitsubishi Evolution and similar performance-oriented transmissions\u003c\/li\u003e\n  \u003cli\u003eHyundai and Kia manual transmissions that call for GL-4\u003c\/li\u003e\n  \u003cli\u003eAftermarket Quaife differentials and synchro systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow will MT-85 affect maintenance and component longevity?\u003c\/h3\u003e\n\u003cp\u003eUsing the correct GL-4 fluid helps reduce gear and synchronizer wear, which can extend service intervals and lower repair costs. MT-85’s formulation aims to maintain film strength under pressure while providing friction control, supporting longer synchro life and consistent gearbox feel over time.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eProtects gears from wear under load\u003c\/li\u003e\n  \u003cli\u003eHelps prolong synchromesh life and performance\u003c\/li\u003e\n  \u003cli\u003eSupports reliable shifting across temperature ranges\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: Drivers and mechanics who need a brass-safe GL-4 manual transmission oil that blends performance and protection—ideal for owners of Nissan 350Z\/370Z, many Maxima\/Altima\/Sentra models, Mitsubishi Evolution, various Hyundai and Kia manuals, and aftermarket Quaife synchro systems. It’s also a strong choice for anyone seeking improved shift quality and longer synchro life without resorting to GL-5 chemistry.\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 MT-85 instead of GL-5 oil?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No—MT-85 is GL-4 and is formulated for brass synchros; GL-5 contains reactive additives that can harm brass synchronizers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What viscosity is MT-85 and is it good in cold climates?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: MT-85 is 75W-85. Its cold-start properties help smoother shifts in cooler temperatures while maintaining protection under load.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Red Line","offers":[{"title":"Default Title","offer_id":48086223356062,"sku":"B004D4URV6","price":43.79,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/red-line-mt-85-front-bottle.jpg?v=1785890470","url":"https:\/\/northtrailauto.ca\/products\/red-line-mt-85-75w-85-gl-4-manual-transmission-gear-oil-1-quart-synchro-safe-protection","provider":"North Trail Auto","version":"1.0","type":"link"}