An exceptionally high performance 100% synthetic 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 temperatures and shock loads found in Big Twin transmissions, Molecular polar bonding technology enables the oil to cling to metal parts under extreme conditions, Provides a protective film that increases lubricity, reduces wear, and extends the life of gears and bearings while reducing drag and provides quieter, smoother shifting, Available in 1-quart bottles