- 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 & MT-90 are not for use in differentials with hypoid gears- Excellent gear and synchro protection, balanced slipperiness for easier shifting in cold climates- Excellent for high- and low-mile transmissions- Compatib le 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- For racing differentials under moderate loads- Popular in racing transmissions like Hewland and other Road Racing dog-ring boxes, Bert and Brinn for Stock Cars, G-Force, and Liberty clutchless for Drag Racing