An exceptionally high performance 100% synthetic transmission oil with ESTER Engineered for use in 4-speed, 5-speed and 6-speed transmissions API GL-5 rated, extreme pressure lubricant for helical or straight cut gears Ideally made to handle the high shock loads in Big Twin transmissions Molecular bonding technology enables the oil to cling to metal parts under extreme conditions Provides a protective film that extends the life of gears and bearings while reducing drag