Part #: 50504. SAE Viscosity Grade (Gear Oil) 75W85. Sold as 1 Quart. MTL, MT-85 and MT-90 are not for use in differentials with hypoid gears. Red Line MT-85 Hight Performance Gear Oil is a full-synthetic ester-based lubricant designed for use in manual transmissions and front-wheel-drive transaxles.