{"product_id":"ultra-1plus-75w-90-full-synthetic-gear-oil-3-quart-api-gl-4-year-round-protection","title":"ULTRA 1PLUS 75W-90 Full Synthetic Gear Oil 3-Quart, API GL-4 Year-Round Protection","description":"\u003cp\u003e\u003cstrong\u003eULTRA 1PLUS SAE 75W-90 Full Synthetic Gear Oil is a premium API GL-4 gear lubricant formulated to protect manual transmissions, transaxles, and differentials across all seasons.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis full synthetic 75W-90 gear oil blends advanced base stocks with anti-scuff additives and friction modifiers to deliver consistent protection under heavy loads and wide temperature swings. Engineered to meet or exceed API GL-4 and SAE J306 specifications, it supports smooth shifting, limits wear on gears and synchronizers, and helps extend component life while resisting oxidation and deposit formation.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this gear oil perform in cold starts and high heat?\u003c\/h3\u003e\n\u003cp\u003eULTRA 1PLUS 75W-90 is designed for year-round performance: it flows at low temperatures for reliable lubrication during cold starts and keeps a stable film at high operating temperatures. The synthetic base oils reduce viscosity breakdown so the gear surfaces remain protected under sustained heat.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMeets SAE J306 low- and high-temperature requirements for consistent viscosity.\u003c\/li\u003e\n  \u003cli\u003eFast low-temperature flow to protect gears at startup.\u003c\/li\u003e\n  \u003cli\u003eHigh thermal stability prevents viscosity loss under heavy loads.\u003c\/li\u003e\n  \u003cli\u003eResists oxidation to reduce varnish and sludge build-up.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this oil reduce wear and maintenance needs?\u003c\/h3\u003e\n\u003cp\u003eThe formula creates a strong, stable lubricant film that lowers metal-to-metal contact, reducing wear on gear teeth, bearings, and synchronizers. With improved protection and cleaner operation, service intervals can be more predictable and component replacement less frequent.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAdvanced anti-scuff chemistry minimizes micro-pitting and abrasion.\u003c\/li\u003e\n  \u003cli\u003eFriction modifiers support smooth synchronizer engagement.\u003c\/li\u003e\n  \u003cli\u003eLimits deposit formation for cleaner internals and less maintenance.\u003c\/li\u003e\n  \u003cli\u003eDesigned to protect gears under high torque and shock loading.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIs this compatible with limited-slip differentials and common drivetrains?\u003c\/h3\u003e\n\u003cp\u003eYes—ULTRA 1PLUS 75W-90 includes friction-modifying technology suitable for many limited-slip differentials while meeting API GL-4 service requirements for manual transmissions and transaxles. Always check vehicle manufacturer recommendations for specific additive compatibility.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAPI GL-4 certified for manual transmissions and transaxles.\u003c\/li\u003e\n  \u003cli\u003eFriction modifiers to support limited-slip function where specified.\u003c\/li\u003e\n  \u003cli\u003eAppropriate for passenger cars and light trucks using GL-4 oils.\u003c\/li\u003e\n  \u003cli\u003eNot a substitute for gear oils requiring GL-5 or special OEM fluids unless approved.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does the oil protect against corrosion, foaming, and oxidation?\u003c\/h3\u003e\n\u003cp\u003eThe additive package contains rust inhibitors, anti-foam agents, and antioxidants that preserve lubricant integrity and cleanliness. This helps the oil maintain full film strength and prevents issues that can lead to premature wear or reduced performance.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eOxidation inhibitors slow thermal breakdown and acid formation.\u003c\/li\u003e\n  \u003cli\u003eRust and corrosion inhibitors protect metal surfaces in wet conditions.\u003c\/li\u003e\n  \u003cli\u003eAnti-foam additives ensure stable film under aeration and agitation.\u003c\/li\u003e\n  \u003cli\u003eHelps maintain clean gear surfaces, lowering deposit-related wear.\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 drivers and mechanics seeking robust, year-round protection for manual transmissions, transaxles, and light-duty differentials. It benefits owners of passenger cars and light trucks who want improved gear life, smoother shifting, and resistance to heat and oxidation. For vehicles specifying GL-4 service and 75W-90 viscosity, this product is a cost-effective, high-performance choice—always verify manufacturer fluid requirements before use.\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 ULTRA 1PLUS 75W-90 in my limited-slip differential?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, the formula includes friction modifiers compatible with many limited-slip systems; check your vehicle manual for specific approvals.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is this oil suitable for extreme cold climates?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, the 75W low-temperature rating ensures improved cold-start flow and protection for winter conditions.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"ULTRA 1PLUS","offers":[{"title":"Default Title","offer_id":67586891972793,"sku":"B098TQXKPP","price":119.28,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/3765\/3177\/files\/ultra-1plus-front-label-3qt_fa782d63-0a29-4c5a-870e-57d579b393d6.jpg?v=1790496204","url":"https:\/\/redleafauto.ca\/products\/ultra-1plus-75w-90-full-synthetic-gear-oil-3-quart-api-gl-4-year-round-protection","provider":"Redleaf Auto","version":"1.0","type":"link"}