{"product_id":"ultra-1plus-sae-75w-90-full-synthetic-gear-oil-6-quart-api-gl-5-mt-1-limited-slip-protection","title":"ULTRA 1PLUS SAE 75W-90 Full Synthetic Gear Oil 6-Quart — API GL-5 MT-1, Limited-Slip Protection","description":"\u003cstrong\u003eULTRA 1PLUS SAE 75W-90 Full Synthetic Gear Oil (API GL-5, MT-1) is a limited-slip capable lubricant formulated to protect differentials and axles while ensuring smooth engagement in limited-slip systems.\u003c\/strong\u003e\n\n\u003cp\u003eThis 6-quart pack of full synthetic SAE 75W-90 gear oil combines extreme-pressure additives, friction modifiers for limited-slip differentials, and thermal stability to help extend gear and bearing life in a wide range of passenger cars, light trucks, and off-road equipment. It meets API GL-5 and MT-1 specifications and is engineered for dependable cold-flow performance and oxidative resistance across seasonal conditions.\u003c\/p\u003e\n\n\u003ch3\u003eHow does ULTRA 1PLUS protect gears under heavy load?\u003c\/h3\u003e\n\u003cp\u003eThe formula includes anti-scuffing extreme-pressure agents that form a robust lubricating film under shock loading and high torque. That film reduces metal-to-metal contact and helps prevent pitting and wear during severe service.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAnti-scuffing additives that resist gear tooth damage\u003c\/li\u003e\n  \u003cli\u003eStable film strength under high torque and shock loads\u003c\/li\u003e\n  \u003cli\u003eReduces maintenance needs by extending gear and bearing life\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this oil work in limited-slip differentials without noise or chatter?\u003c\/h3\u003e\n\u003cp\u003eYes—ULTRA 1PLUS contains dedicated limited-slip (LS) additives and friction modifiers to minimize differential chatter and ensure smooth torque transfer. The result is consistent limited-slip performance across varied driving conditions.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eLS chemistry tuned to prevent engagement noise in clutch-type differentials\u003c\/li\u003e\n  \u003cli\u003eSmooth, predictable torque transfer for cornering and traction situations\u003c\/li\u003e\n  \u003cli\u003eCompatible with systems specifying GL-5\/MT-1 performance\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does the 75W-90 synthetic blend perform in cold and hot climates?\u003c\/h3\u003e\n\u003cp\u003eThe SAE 75W-90 full synthetic base delivers reliable cold-start flow and maintains protective viscosity at elevated temperatures. Its oxidative and thermal stability resists varnish and foaming, helping preserve lubricating properties over extended drain intervals.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eExcellent low-temperature pour and pumpability for cold starts\u003c\/li\u003e\n  \u003cli\u003eResists oxidation and varnish for longer service life\u003c\/li\u003e\n  \u003cli\u003eMaintains viscosity to protect gears at high operating temperatures\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIs this available in other sizes or for fleet use?\u003c\/h3\u003e\n\u003cp\u003eWhile this listing covers the convenient 6-quart pack for individual servicing, the ULTRA 1PLUS formulation is also offered in larger containers for shops and fleets. The bulk options reduce per-unit cost for frequent service on multiple vehicles or heavy-use equipment.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e6-quart packs ideal for one-vehicle differential or axle service\u003c\/li\u003e\n  \u003cli\u003eBulk pails available for shops and fleet maintenance needs\u003c\/li\u003e\n  \u003cli\u003eAPI GL-5 and MT-1 ratings suitable for a wide range of gearboxes\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: ULTRA 1PLUS SAE 75W-90 Full Synthetic Gear Oil is designed for owners, mechanics, and fleet managers who need a high-performance, limited-slip-capable gear lubricant that performs across seasons. It fits light- and medium-duty differentials and axles requiring API GL-5 or MT-1 specifications, and is a practical choice for anyone seeking extended gear protection, reduced maintenance, and consistent limited-slip operation.\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 ULTRA 1PLUS SAE 75W-90 be used in limited-slip differentials?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. It contains LS additives and friction modifiers formulated to reduce chatter and provide smooth limited-slip performance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does this oil meet industry specifications for heavy-duty gears?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The product meets API GL-5 and MT-1 specifications suitable for many passenger, light truck, and commercial differentials.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"ULTRA 1PLUS","offers":[{"title":"Default Title","offer_id":48082829213854,"sku":"B09FM816ZH","price":109.98,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/ultra-1plus-front-packaging-6qt.jpg?v=1785815799","url":"https:\/\/northtrailauto.ca\/products\/ultra-1plus-sae-75w-90-full-synthetic-gear-oil-6-quart-api-gl-5-mt-1-limited-slip-protection","provider":"North Trail Auto","version":"1.0","type":"link"}