What does GL-5 mean in gear oil?

Extreme Pressure
A GL-5 grade oil has a very high rating for EP (Extreme Pressure) protection. EP gear oils contain additives that prevent metal surfaces from cold welding under the extreme pressure conditions found in situations where boundary lubrication prevails. This is normal and acceptable in all steel gears.

What is SAE 90 used for?

Phillips 66® Transmission Oil SAE 90 is an SAE 90 mineral oil gear lubricant recommended for use in manual transmissions, transfer cases and rear axle assemblies of automotive, farm and off-highway equipment where the manufacturer specifies an API GL-1 gear oil.

What is the difference between hypoid and regular gear oil?

The term “hypoid” has more to do with the construction of engine gears than it does with oil. Due to the higher pressure on gears as a result, the lubrication needed has to include ingredients to provide more protection for the gears. This special gear oil is designed not to deconstruct under higher pressure.

What is the GL rating on gear oil?

Gearbox oils are classified by the American Petroleum Institute using GL ratings. The higher an oil’s GL-rating, the more pressure can be sustained without any metal-to-metal contact taking place between transmission components.

Is 90 gear oil good for motorcycle chain?

It’s perfectly fine to use gear oil for lubing motorcycle’s chain, I’m myself using it for years. Use 90 grade gear oil if you lube every 500–700km while the thicker 140 grade oil lasts for 800–1000 km. Also, there’s no need to clean the chain every 500km. Clean the chain when it’s visibly dirty & mucky.

What are hypoid gears and why are hypoid gears used?

Hypoid gears are typically used in rear-drive automobile drivetrains. A higher hypoid offset allows the gear to transmit higher torque. However increasing the hypoid offset results in reduction of mechanical efficiency and a consequent reduction in fuel economy.