{"product_id":"triax-synergy-gear-mt-75w-90-gl-4-manual-transmission-fluid-smooth","title":"TRIAX Synergy Gear MT 75W-90 GL-4 Manual Transmission Fluid - Smooth","description":"\u003cp\u003eIn this review of the TRIAX Synergy Gear MT 75W-90 GL-4 manual transmission fluid, the bottom line is clear: this full synthetic fluid is for drivers who need dependable, smooth shifting and strict compatibility with brass or yellow-metal synchros. It stands out because it is specifically formulated to deliver frictional stability and synchronizer engagement without reactive sulfurs, so owners of older European and domestic manuals, high mileage gearboxes, or performance transmissions get consistent feel and reduced shudder across a wide range of conditions.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide compatibility:\u003c\/strong\u003e Designed to work wherever SAE 75W-90 GL-4 is specified, covering many Jeep, Chrysler, BMW, VW\/Audi, Ford, GM, Mercedes Benz, Toyota and Mazda manual gearboxes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrictionally optimized:\u003c\/strong\u003e The formulation promotes exceptionally smooth shifting and predictable synchronizer engagement for reduced notchiness and quicker gear changes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eYellow metal safe:\u003c\/strong\u003e No reactive sulfurs means safe use with brass, bronze, copper and aluminum synchro components found in sensitive transmissions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull synthetic base:\u003c\/strong\u003e A PAO\/ester blend provides a very low pour point and strong film stability for cold starts and high temperature protection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh load protection:\u003c\/strong\u003e Formulated to protect gears under high horsepower, sustained mechanical and thermal loads typical of racing or off-road use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLong drain potential:\u003c\/strong\u003e The chemistry supports extended drain intervals, often well beyond typical service periods for lower grade fluids.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis fluid is best for owners of manual-transmission vehicles that call for SAE 75W-90 GL-4 and especially for cars with brass or bronze synchros where reactive additives could cause harm. It is also a good fit for high mileage transmissions that need improved shift feel, and for enthusiasts who push gearboxes in racing or off-road conditions and want consistent protection.\u003c\/p\u003e\n\u003cp\u003eThose who should look elsewhere include owners who specifically require GL-5 specifications or automatics that need ATF, and drivers with transmissions that mandate a manufacturer-branded proprietary fluid not covered by GL-4. If your vehicle manual explicitly forbids GL-4, choose the specified alternative instead.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eImproves shiftability and reduces notchiness, as reported by users with high mileage T-56 and other manuals.\u003c\/li\u003e\n\u003cli\u003eSynchro safe for yellow metal and copper alloys, reducing risk to sensitive components.\u003c\/li\u003e\n\u003cli\u003eFull synthetic PAO\/ester base gives reliable cold start shifting and high temperature film strength.\u003c\/li\u003e\n\u003cli\u003eRobust protection under high load and extended drain capability offers long-term value for many drivers.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eNot suitable where a GL-5 or a specific proprietary transmission fluid is required by the manufacturer.\u003c\/li\u003e\n\u003cli\u003eTechnical full synthetic formulation may be more costly than basic mineral alternatives.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct type\u003c\/td\u003e\n\u003ctd\u003eFull synthetic manual transmission fluid\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eViscosity\u003c\/td\u003e\n\u003ctd\u003eSAE 75W-90\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePerformance spec\u003c\/td\u003e\n\u003ctd\u003eGL-4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSynchro compatibility\u003c\/td\u003e\n\u003ctd\u003eYellow metal, brass, copper and aluminum safe\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBase oils\u003c\/td\u003e\n\u003ctd\u003ePAO \/ Ester full synthetic blend\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCold temperature\u003c\/td\u003e\n\u003ctd\u003eVery low pour point, shifts at very low temps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTypical use\u003c\/td\u003e\n\u003ctd\u003eManual transmissions, high load and performance applications\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe TRIAX Synergy Gear MT 75W-90 GL-4 is a strong choice for drivers who need a synchro-safe, full synthetic manual fluid that improves shift feel and stands up to high loads. It delivers good value for high mileage and performance applications where GL-4 coverage and yellow-metal safety are required, though owners needing GL-5 or a specific branded fluid should follow their manufacturer guidance.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use this in any manual transmission?\u003c\/strong\u003e\u003cbr\u003eUse it where SAE 75W-90 GL-4 is specified; do not use it in gearboxes that require GL-5 or a proprietary fluid.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it safe for brass synchros?\u003c\/strong\u003e\u003cbr\u003eYes, the formulation is yellow metal safe and contains no reactive sulfurs, making it compatible with brass and similar alloys.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow does it perform in cold weather?\u003c\/strong\u003e\u003cbr\u003eThe PAO\/ester full synthetic base yields a very low pour point and rapid shifting even in very cold conditions.\u003c\/p\u003e","brand":"Triax","offers":[{"title":"Default Title","offer_id":48638035656923,"sku":"B0C5JX2LJ1","price":46.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/715hb7DnRbL._SL1500.jpg?v=1778606674","url":"https:\/\/gearmusthave.com\/products\/triax-synergy-gear-mt-75w-90-gl-4-manual-transmission-fluid-smooth","provider":"GearMustHave","version":"1.0","type":"link"}