{"product_id":"aeroshell-555-turbine-oil","title":"AeroShell Turbine Oil 555 Synthetic Oil (DOD-PRF-85734A \/ DEF STAN 91-100)","description":"\u003ch3\u003eHigh-Load Helicopter Transmission \u0026amp; Turbine Oil\u003c\/h3\u003e\n\u003cp\u003eAeroShell Turbine Oil 555 is an advanced 5 mm²\/s (cSt) synthetic hindered ester oil specifically engineered to withstand extreme temperatures and severe load-carrying requirements. Originally formulated for supersonic engines and military specifications including \u003cstrong\u003eDEF STAN 91-100\u003c\/strong\u003e (formerly DERD 2497) and \u003cstrong\u003eXAS-2354\u003c\/strong\u003e, AeroShell 555 features a specialized extreme-pressure additive package designed to protect heavily loaded gear systems from scoring and wear.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHelicopter \u0026amp; MRO Advantage:\u003c\/strong\u003e Fully approved to U.S. Military Specification \u003cstrong\u003eDOD-PRF-85734A\u003c\/strong\u003e (NATO Code O-160 \/ Joint Service Designation OX-26), AeroShell 555 is the primary choice for high-power helicopter transmissions, main rotor gearboxes, and turboshaft powerplants. It delivers exceptional thermal-oxidative stability, rust inhibition, and gear load capacity far exceeding standard MIL-PRF-23699 formulations.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOrdering Information:\u003c\/strong\u003e\u003cbr\u003e• \u003cstrong\u003eQuart Can (1 US Qt):\u003c\/strong\u003e MFG # 550050220\u003cbr\u003e• Please verify system seal compatibility (synthetic ester base) and required quantities with our aviation supply specialists before ordering.\u003c\/p\u003e\n\u003ch3\u003eKey Characteristics \u0026amp; Performance Benefits\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDOD-PRF-85734A Helicopter Approved:\u003c\/strong\u003e Qualified under military performance standards explicitly governing high-load helicopter transmission and gearbox lubrication.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme Load-Carrying Capacity:\u003c\/strong\u003e Formulated with advanced anti-wear and extreme-pressure additives to protect heavily stressed gear teeth under peak torque loads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Thermal \u0026amp; Oxidation Defense:\u003c\/strong\u003e Resists oil degradation, varnish, and acid formation under continuous high-temperature operating conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorrosion \u0026amp; Wear Protection:\u003c\/strong\u003e Extends critical transmission component life by shielding internal steel and bronze alloys against rust, pitting, and scoring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMulti-Spec OEM Approvals:\u003c\/strong\u003e Approved for demanding applications requiring Pratt \u0026amp; Whitney 521 C Type II and General Electric D-50 TF 1 performance criteria.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTypical Aviation Applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHelicopter Gearboxes \u0026amp; Transmissions:\u003c\/strong\u003e Primary lubricating oil for main and tail rotor transmission systems specifying DOD-PRF-85734A or high-load 5 cSt fluids.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Load Turboshaft Engines:\u003c\/strong\u003e Deployed in military and commercial helicopter turboshaft engines operating in severe thermal environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupersonic \u0026amp; Advanced Gas Turbines:\u003c\/strong\u003e Suitable for specialized high-compression engines requiring DEF STAN 91-100 \/ XAS-2354 conformance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Accessory Gearboxes:\u003c\/strong\u003e Lubricates constant speed drives, starters, and high-torque auxiliary power units (APUs).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specifications \u0026amp; Military Approvals\u003c\/h3\u003e\n\u003ctable style=\"width: 100.071%; height: 117.6px;\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 33.2332%; height: 19.6px;\"\u003e\u003cstrong\u003eManufacturer \/ Product Line\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 64.2933%; height: 19.6px;\"\u003eShell Aviation \/ AeroShell® Turbine Oil 555\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 33.2332%; height: 19.6px;\"\u003e\u003cstrong\u003eUS Military Specification\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 64.2933%; height: 19.6px;\"\u003eDOD-PRF-85734A (Helicopter Transmission \u0026amp; Gearbox Oil)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 33.2332%; height: 19.6px;\"\u003e\u003cstrong\u003eBritish Military Standard\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 64.2933%; height: 19.6px;\"\u003eDEF STAN 91-100 (Formerly DERD 2497) | XAS-2354\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 33.2332%; height: 19.6px;\"\u003e\u003cstrong\u003eNATO \u0026amp; Joint Service Codes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 64.2933%; height: 19.6px;\"\u003eNATO Code O-160 | Joint Service Designation OX-26\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 33.2332%; height: 19.6px;\"\u003e\u003cstrong\u003eOEM Approvals\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 64.2933%; height: 19.6px;\"\u003ePratt \u0026amp; Whitney 521 C Type II | General Electric D-50 TF 1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 33.2332%; height: 19.6px;\"\u003e\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 64.2933%; height: 19.6px;\"\u003eQuart Can (1 US Qt): MFG # 550050220\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Aeroshell","offers":[{"title":"Can (QT)","offer_id":51659607769460,"sku":"AER0SHELL555QT","price":23.35,"currency_code":"USD","in_stock":true},{"title":"Case of 24 QT - FREE GROUND SHIPPING","offer_id":54025015820660,"sku":"AER0SHELL555QT-CS","price":542.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0888\/2991\/9604\/files\/aeroshell-555-turbine-oil-dod-prf-85734a-550050220-quart.png?v=1787758053","url":"https:\/\/145.aero\/products\/aeroshell-555-turbine-oil","provider":"Aircraft Shop Supply","version":"1.0","type":"link"}