Designed for transmissions and transaxles - helps to slow synchros for easier shifting across a broad temperature rangeContains extreme pressure additives like our 75W90 GL-5 oil, but lacks friction modifiers to balance slipperinessHelps with lock-up on weak limited-slip differentials-compatible with Red Line Limited Slip Friction Modifier for tuning slippageRecommended for API GL-5, GL-6, MT-1, MIL-L-2105E and SAE J2360Appropriate coefficient of friction for most manual transmission synchronizers (other's synthetic gear oils are often too slippery for proper synchro engagement)ABOUT RED LINE GEAR OIL FOR MANUAL TRANSMISSIONS 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-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 Compatible with petroleums and other synthetics