{"product_id":"ultra-1plus-full-synthetic-gear-oil-sae-75w-90-1-gallon-api-gl-5-mt-1-limited-slip-protection","title":"ULTRA 1PLUS Full Synthetic Gear Oil SAE 75W-90 — 1 Gallon, API GL-5 MT-1, Limited-Slip Protection","description":"\u003cp\u003e\u003cstrong\u003eULTRA 1PLUS SAE 75W-90 Full Synthetic Gear Oil is a GL-5\/MT-1 rated lubricant designed to protect differentials and axles with limited-slip compatibility and reliable all-season performance.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis full synthetic 75W-90 gear oil combines extreme-pressure additives, friction modifiers for limited-slip systems, and oxidative-resistant base stocks to deliver consistent protection across a wide range of temperatures and loads. Formulated to meet API GL-5 and MT-1 standards, it maintains film strength under shock loading and reduces wear, while resisting varnish and foam that can degrade performance. It’s offered in a convenient 1-gallon container for retail users, and is also available in a 5-gallon pail for fleets and shops seeking bulk value.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this gear oil protect gears under heavy loads?\u003c\/h3\u003e\n\u003cp\u003eThe formula includes anti-scuffing extreme-pressure additives that form a protective film on gear teeth during high torque and shock events. That film reduces metal-to-metal contact and slows wear, helping gears and bearings last longer under severe service conditions.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAnti-scuff additives reduce scoring under shock loading\u003c\/li\u003e\n  \u003cli\u003eStable film strength maintains lubrication at high contact pressures\u003c\/li\u003e\n  \u003cli\u003eReduced maintenance needs from extended component life\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill ULTRA 1PLUS 75W-90 work with limited-slip differentials?\u003c\/h3\u003e\n\u003cp\u003eYes — the oil contains dedicated limited-slip friction modifiers designed to eliminate chatter and ensure smooth torque transfer in clutch-type differentials. It balances slip control with protection so limited-slip systems operate quietly and predictably.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eEngineered LS additives prevent differential chatter\u003c\/li\u003e\n  \u003cli\u003eSmooth clutch engagement for consistent traction feel\u003c\/li\u003e\n  \u003cli\u003eCompatible with most limited-slip designs that accept GL-5 fluids\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does it perform across temperatures and seasons?\u003c\/h3\u003e\n\u003cp\u003eAs a full synthetic SAE 75W-90, this gear oil flows freely at low temperatures for easier cold starts and retains viscosity and film integrity at high operating temperatures. The synthetic base resists oxidation and varnish, so the fluid keeps protective properties longer between service intervals.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eExcellent cold-flow characteristics for winter starts\u003c\/li\u003e\n  \u003cli\u003eHigh-temperature stability prevents breakdown and foaming\u003c\/li\u003e\n  \u003cli\u003eOxidation resistance reduces sludge and deposit formation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat sizes and applications are best for this product?\u003c\/h3\u003e\n\u003cp\u003ePrimarily sold in a 1-gallon container for consumer retail use, ULTRA 1PLUS 75W-90 is also available in a 5-gallon pail for workshops and fleets. It’s suitable for automotive and light-truck differentials, transfer cases specifying GL-5\/MT-1, and heavy-duty axles where a heavy-duty synthetic gear oil is recommended.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e1-gallon packs for DIY and retail customers\u003c\/li\u003e\n  \u003cli\u003e5-gallon pail option for shops and fleet maintenance\u003c\/li\u003e\n  \u003cli\u003eRecommended for GL-5\/MT-1 specified differentials and axles\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: ULTRA 1PLUS SAE 75W-90 Full Synthetic Gear Oil is aimed at motorists and professional technicians who need robust, all-season gear protection with limited-slip compatibility. It suits drivers who tow or carry heavy loads, shops servicing mixed vehicle fleets, and anyone wanting synthetic-grade performance to extend gear and bearing life while minimizing noise and maintenance downtime.\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 ULTRA 1PLUS 75W-90 suitable for limited-slip differentials?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. It contains limited-slip friction modifiers to reduce chatter and ensure smooth clutch engagement in most LS differentials.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I use this oil in cold climates?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. Its full synthetic SAE 75W-90 formulation provides good cold-flow for easier cold starts and reliable protection in low temperatures.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"ULTRA 1PLUS","offers":[{"title":"Default Title","offer_id":48083193266334,"sku":"B08NRDF2DT","price":64.98,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/ultra-1plus-front-label-1-gallon_463d7127-70a6-41fd-bc3a-dd42bbbf6ddd.jpg?v=1785828283","url":"https:\/\/northtrailauto.ca\/products\/ultra-1plus-full-synthetic-gear-oil-sae-75w-90-1-gallon-api-gl-5-mt-1-limited-slip-protection","provider":"North Trail Auto","version":"1.0","type":"link"}