{"product_id":"royal-purple-max-gear-75w-90-gear-oil-6-quart-case-synthetic-gl-5-gl-4-with-synerlec-protection","title":"Royal Purple Max Gear 75W-90 Gear Oil, 6-Quart Case — Synthetic GL-5\/GL-4 with Synerlec Protection","description":"\u003cstrong\u003eRoyal Purple Max Gear 75W-90 is a high-performance synthetic hypoid gear oil formulated to protect heavily loaded gears, bearings and differentials while reducing drag and noise.\u003c\/strong\u003e\n\n\u003cp\u003eDesigned for automotive, truck and marine lower-gear applications that call for API GL-5 or GL-4 fluids, this 6-quart case of Royal Purple Max Gear (75W-90) blends premium synthetic base oils with Royal Purple's Synerlec additive technology for extended component life and reliable corrosion resistance. It’s safe for use with yellow metals and synchronizers, and it requires no extra additives thanks to its built-in friction modifier. The formulation focuses on improved gear smoothness, cooler running temperatures and quieter operation compared with many conventional oils.\u003c\/p\u003e\n\n\u003ch3\u003eHow does Max Gear protect gears and bearings under heavy load?\u003c\/h3\u003e\n\u003cp\u003eMax Gear combines a high-quality synthetic lubricant base with a proprietary additive system that creates a strong, lubricating film on gear teeth and bearing surfaces. That film helps prevent metal-to-metal contact under high pressure and shock loads, reducing wear and extending component life without the need for aftermarket additives.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSynthetic base oils for thermal stability and shear resistance\u003c\/li\u003e\n  \u003cli\u003eSynerlec additives that enhance film strength and protect metal surfaces\u003c\/li\u003e\n  \u003cli\u003eFriction modifier included to reduce micro-welding and scuffing\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCan I use this oil in differentials, manual transmissions and marine gear units?\u003c\/h3\u003e\n\u003cp\u003eYes. Royal Purple Max Gear 75W-90 meets API GL-5 and GL-4 service categories, making it suitable for many automotive and truck differentials, manual transmissions that accept GL-4\/GL-5 fluids, and marine lower units that specify these ratings. Always check your equipment manufacturer’s recommendations for viscosity and API service before changing fluids.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRecommended for front and rear differentials and manual transmissions\u003c\/li\u003e\n  \u003cli\u003eCompatible with many marine lower gear units specifying GL-5\/GL-4\u003c\/li\u003e\n  \u003cli\u003eNon-corrosive to brass, bronze and copper components\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat performance benefits will I notice after switching to Max Gear?\u003c\/h3\u003e\n\u003cp\u003eAfter switching, most users observe smoother gear engagement, reduced driveline noise and lower operating temperatures under load. The product’s combination of synthetic oil and Synerlec reduces drag and wear, which can improve drivetrain efficiency in trucks, 4x4s and heavy-duty equipment.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eQuieter gear operation and smoother shifts\u003c\/li\u003e\n  \u003cli\u003eLower operating temperatures under severe conditions\u003c\/li\u003e\n  \u003cli\u003eReduced drivetrain drag for potential efficiency gains\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eDoes this oil require extra additives or special maintenance steps?\u003c\/h3\u003e\n\u003cp\u003eNo extra additives are necessary; Max Gear is formulated with a friction modifier and corrosion inhibitors built in. Maintenance follows standard gear oil change intervals and inspection routines recommended by your vehicle or equipment manufacturer.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePre-packaged with friction modifier—no aftermarket friction additives needed\u003c\/li\u003e\n  \u003cli\u003eFollow OEM service intervals for oil changes and inspections\u003c\/li\u003e\n  \u003cli\u003eEnsure seals and gaskets are compatible when performing service\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: Royal Purple 75W-90 Max Gear is aimed at owners and technicians of trucks, SUVs, 4x4s, passenger cars with hypoid gears, and marine lower units that require API GL-5 or GL-4 lubricants. It's well suited for fleet operators, performance enthusiasts and anyone who wants a synthetic gear oil designed to reduce wear, noise and heat in heavily loaded driveline applications. Always verify viscosity and API requirements in your owner's manual before installing.\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 Royal Purple Max Gear 75W-90 compatible with GL-5 and GL-4 requirements?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. It meets API GL-5 and GL-4 service categories and is suitable where those specifications are called for.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Do I need to add any extra friction modifiers or additives?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No. Max Gear includes a built-in friction modifier and corrosion inhibitors, so no additional additives are required.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Royal Purple","offers":[{"title":"Default Title","offer_id":55170613444951,"sku":"B00TO65GFK","price":153.11,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/royal-purple-max-gear-front-case.jpg?v=1790431828","url":"https:\/\/britishgarage.co.uk\/products\/royal-purple-max-gear-75w-90-gear-oil-6-quart-case-synthetic-gl-5-gl-4-with-synerlec-protection","provider":"British Garage","version":"1.0","type":"link"}