GL-4 Grade is a gear oil range under API GL-4. Grades: GL4 75W80, GL4 85W90, GL4 85W140. API 1560 describes GL-4 as intended for axles with spiral-bevel gears under moderate to severe conditions, or hypoid gears under moderate conditions; it is also used in some manual transmissions and transaxles.
Grades & published data
Typical values from the product data sheet, each with its test method.
| Property | GL4 85W90 | GL4 75W80 | GL4 85W140 | Method |
|---|---|---|---|---|
| Kinematic viscosity at 100 °CcSt | 17 | 8.6 | 25 | ASTM D-445 |
| Viscosity index | 90 | 150 | 95 | ASTM D-2270 |
| Pour point°C | -18 | -36 | -12 | ASTM D-97 |
| Flash point (open cup)°C | 210 | 180 | 215 | ASTM D-92 |
| Density at 15 °Ckg/m³ | 900 | 875 | 900 | ASTM D-4052 |
Overview
GL-4 Grade is a gear oil range under API GL-4. Grades: GL4 75W80, GL4 85W90, GL4 85W140. API 1560 describes GL-4 as intended for axles with spiral-bevel gears under moderate to severe conditions, or hypoid gears under moderate conditions; it is also used in some manual transmissions and transaxles.
Every grade has its own row in the specification table, with viscosity at 100 °C, viscosity index, flash point, pour point and density.
Application
Gearboxes whose manufacturer specifies API GL-4.
Application
Axles with spiral-bevel gears operating under moderate to severe conditions.
Feature
GL4 75W80: KV100 8.6 cSt, VI 150, pour point -36 °C, flash point 180 °C; GL4 85W90: KV100 17 cSt, VI 90, pour point -18 °C, flash point 210 °C; GL4 85W140: KV100 25 cSt, VI 95, pour point -12 °C, flash point 215 °C.
Order the grade that matches the viscosity and API designation in the gearbox or axle manual. Each grade's values are listed separately in the specification table.
Next step
The range above is what we publish. Formulation to a customer brief is a route of its own, and a sample is the first stage of it.
