Overview
GL-5 75W-80 is a gear oil in the SAE 75W-80 viscosity grade, catalogued under API GL-5 and listed for manual gearboxes. API 1560 describes GL-5 as intended for gears, particularly hypoid gears, in axles operating under combinations of high-speed shock load and low-speed, high-torque conditions.
Published typical values are a kinematic viscosity of 8.2 cSt at 100 °C, a viscosity index of 153 and a pour point of -33 °C, together with flash point, appearance and copper corrosion (ASTM D130) in the specification table.
Application
Axles and final drives
Differentials and axles, including hypoid gear sets, where the vehicle manufacturer specifies API GL-5.
Application
Manual gearboxes that specify GL-5
Manual transmissions whose manual calls for a GL-5 gear oil in this viscosity grade. Some manual gearboxes specify GL-4 instead; check before use.
Feature
SAE 75W-80 gear oil
Viscosity at 100 °C of 8.2 cSt and viscosity index 153 (ASTM D445 / D2270).
Feature
Low-temperature flow
Published pour point of -33 °C (ASTM D97).
Feature
Copper corrosion reported
Copper-strip corrosion at 100 °C (ASTM D130) is part of the published test set.
