Chemicals & Fluids › Twin 75W90 Gear Oil Image 1 of 1 Twin 75W90 Gear Oil $27.73 An exceptionally high performance 100% synthetic transmission oil with ESTEREngineered for use in 4-speed, 5-speed and 6-speed transmissionsAPI GL-5 rated, extreme pressure lubricant for helical or straight cut gearsIdeally made to handle the high shock loads in Big Twin transmissionsMolecular bonding technology enables the oil to cling to metal parts under extreme conditionsProvides a protective film that extends the life of gears and bearings while reducing drag Quantity: Purchase Added! An exceptionally high performance 100% synthetic transmission oil with ESTEREngineered for use in 4-speed, 5-speed and 6-speed transmissionsAPI GL-5 rated, extreme pressure lubricant for helical or straight cut gearsIdeally made to handle the high shock loads in Big Twin transmissionsMolecular bonding technology enables the oil to cling to metal parts under extreme conditionsProvides a protective film that extends the life of gears and bearings while reducing drag