VP Classic® GL-4 Gear Oil SAE 80W-90 is an API GL-4 lubricant designed for use with ‘yellow metals’ in synchronizers, thrust washers, bushings and other components typically found in classic manual transmissions and transaxles. VP applies a 3-pronged approach to lubricant design for remarkably stable oils that allow race engines of all types to achieve extraordinary performance and durability:
- Improve the ability of the oil to cling to metal components by improving viscosity through the use of select base oils with polar characteristics.
- Add a balance of multiple anti-wear chemistries beyond ZDDP into the oil that adhere to metal surfaces to create a protection layer.
- Add unique friction modifiers that reduce fluid- to- fluid friction and surface friction between the oil and moving metal components to unlock horsepower and torque.