Caltex Gear Oil GL-5 80W-90 is a multi-purpose oil. They are made from a paraffin base and contain a balanced additive package to provide tooth protection and long oil life. The sulfur-phosphorus extreme pressure additive technology used in the Delo Gear EP-5 provides outstanding thermal and oxidation stability. In addition, this oil is fortified with rust and corrosion inhibitors, foam inhibitors and pour point depressants.