Hypoid is a fancy way of saying the gears mesh multiple teeth becuase the pinion and ring gear angle are not centered. Any good quality gear oil is fine multi viscosity is fine and long as it's 80w xxx. I use royal purple 80w 145 have been since my bike hit 500 miles 1qt bottle will last a very long time since this area is. It serviced very often
2008 V-Star Silverado 1100. K&N filter, airbox mod passenger floor boards, all light visors, ISO grips, Cobra slash cut mufflers, Saddleman touring seat/ tourpack. Lots of little extras.