Since most GL-5 gear oils for differentials are too slippery for manual transmissions, Red Line offers these products that ensure proper shifting while providing ultimate wear protection Appropriate coefficient of friction for most manual transmission synchronizers (other's synthetic gear oils are often too slippery for proper synchro engagement) Red Line offers lubricants to pinpoint nearly every transmission application MTL, MT-85 and MT-90 are not for use in differentials with hypoid gears Details: Sold as 1 Gallon Excellent gear and synchro protection, balanced slipperiness for easier shifting in cold climates Excellent for high- and low-mile transmissions Compatible with petroleums and other synthetics Film thickness greater than an SAE 75W140, yet low fluid friction like 80W gear oil or 30W motor oil Excellent low-temp flow, improved cold shifting