{"product_id":"penngrade-1-hypoid-gear-oil-gl-5-75w-90-1-qt-synthetic-differential-27-7766-6","title":"PennGrade 1 Hypoid Gear Oil | Full-Synthetic Differential | GL-5 75W-90 (27-7766-6)","description":"\u003ch2\u003e\u003cb\u003ePennGrade 1 Hypoid Gear Oil — GL-5, 75W-90 Full Synthetic (1 qt)\u003c\/b\u003e\u003c\/h2\u003e\u003cp\u003eA \u003cb\u003efull-synthetic\u003c\/b\u003e gear oil for hypoid differentials. The synthetic base stock provides better cold-flow characteristics than conventional 80W-90, plus superior shear stability under high load.\u003c\/p\u003e\u003ch3\u003e\u003cb\u003eVehicle Fitment\u003c\/b\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eHypoid differentials:\u003c\/b\u003e trucks, hot rods, and modern rear-drive vehicles requiring GL-5 spec\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCold-flow applications:\u003c\/b\u003e where 75W-90 performance is preferred over 80W-90 conventional\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eNot for VW air-cooled transaxles:\u003c\/b\u003e VW boxes are GL-4 — use part 27-7729-6 instead\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cb\u003eWhy Choose PennGrade 1?\u003c\/b\u003e\u003c\/h3\u003e\u003cp\u003ePennGrade 1 is the modern brand name for the legendary \"Brad Penn\" green oil — refined in Pennsylvania from paraffinic crude, long a favorite of vintage and air-cooled engine builders. Made in the USA.\u003c\/p\u003e\u003ch3\u003e\u003cb\u003eKey Features \u0026amp; Benefits\u003c\/b\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eFull-synthetic base stock:\u003c\/b\u003e better cold-flow than conventional 80W-90.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eSuperior shear stability:\u003c\/b\u003e holds viscosity under high load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eGL-5 protection:\u003c\/b\u003e extreme-pressure additives for hypoid differential gear sets.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cb\u003eTechnical Specifications\u003c\/b\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eEMPI Part #:\u003c\/b\u003e 27-7766-6\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eGrade:\u003c\/b\u003e 75W-90\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eAPI:\u003c\/b\u003e GL-5\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eType:\u003c\/b\u003e Full Synthetic\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eVolume:\u003c\/b\u003e 1 quart bottle, sold individually (case of 12)\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eUPC:\u003c\/b\u003e 707924571158\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCountry of Origin:\u003c\/b\u003e USA\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cb\u003eFrequently Asked Questions\u003c\/b\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eCan I use this in my VW air-cooled transaxle?\u003c\/b\u003e No. The VW transaxle is a GL-4 application — GL-5 additives can attack the brass synchros. Use PennGrade 1 GL-4 80W-90 (part 27-7729-6) in a VW box instead.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eWhy choose 75W-90 synthetic over 80W-90 conventional?\u003c\/b\u003e The synthetic base stock offers better cold-flow characteristics and superior shear stability under high load.\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003ch3\u003e\u003cb\u003eExplore Related Categories\u003c\/b\u003e\u003c\/h3\u003e\u003cp\u003e\u003ca href=\"\/collections\/oils\"\u003eOils \u0026amp; Lubricants\u003c\/a\u003e · \u003ca href=\"\/collections\/drivetrain-transmission\"\u003eDrivetrain \u0026amp; Transmission\u003c\/a\u003e · \u003ca href=\"\/collections\/axles\"\u003eAxles\u003c\/a\u003e\u003c\/p\u003e","brand":"PennGrade 1","offers":[{"title":"Default Title","offer_id":45031565557875,"sku":"27-7766-6","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0278\/2760\/1523\/files\/PG1-FS-Hypoid-Blower-RO_75W-90-Qt.jpg?v=1779613518","url":"https:\/\/www.washburnsmetal.com\/products\/penngrade-1-hypoid-gear-oil-gl-5-75w-90-1-qt-synthetic-differential-27-7766-6","provider":"Washburn's Metal","version":"1.0","type":"link"}