What’s the difference between API GL-4 and GL-5 gear oil?
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What is API GL-4 and GL-5 gear oil?
API GL-4 and GL-5 gear oils are 2 different gear oil grades for vehicle gear lubrication. They are mainly designed for different gear parts and working conditions to provide comprehensive protection for gear.
Gear oil API GL-4 is used for manual transmission gears and is suitable for moderate loads transmission application.
Gear oil API GL-5 is a high performance gear oil for hypoid gear. Hypoid gears bear a complex condition of high speed impact load, high speed low torque and low speed high torque. The gear surface is mainly lubricant friction, that is difficulty to form a complete oil film, making the gear in a boundary lubricant for a long time.
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What's the difference between API GL-4 and GL-5 gear oils? Can they be mixed?
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Project |
API GL-4 Gear Oil |
API GL-5 Gear Oil |
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Extreme Pressure Additive Concentration |
Lower, it is half of the API GL-5 gear oil |
Higher |
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Activity Intensity |
Moderate |
Higher |
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Performance Requirements |
It mainly emphasizes the moderate working condition comprehensive lubrication. |
GL-5 needs to pass the for 4 SwRI tests of moisture corrosion, low speed and high torque, high-speed shock loads, thermal oxidation stability and has higher demands for extreme pressure performance and thermal stability. |
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Thermal Stability Requirements |
Lower, and it's better suited to the relatively moderate operating temperature of a manual transmission. |
It's extremely strict that the oil needs to keep stable under high temperature and long-term ventilation. It doesn't produce harmful sediment. |
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Viscosity Grade |
The selection range for multi-grade oils is relatively narrow. |
The selection range for multi-grade oils is relatively wider, and it has a better viscosity adaptability and low temperature starting capability under a wide temperature range. |
API GL-4 and GL-5 gear oils can not be mixed in most circumstances.
In particular, GL-5 gear oil-due to its highly active extreme-pressure additives-may cause corrosion of copper-based components under high-temperature operating conditions, as the sulfur-phosphorus-type additives decompose to generate active sulfur. Therefore, it should not be used in transmissions specifically designated for GL-4 oil; even the addition of a small amount is not recommended.
Mixing the gear oils API GL-4 and GL-5 together can cause gear corrosion and friction that is highly likely to void the vehicle warranty.
How to choose the suitable gear oils?
Chorus gear oil additives are recommended.
Knowing the difference between gear oil API GL-4 and GL-5 in extreme pressure additive concentration, thermal stability, and the practical problems of a lubricant formulating factory facing is how to formulate the proper gear oils according to the different working conditions that meet specific grade requirements.
The key is relying on the choice of extreme pressure additives.
Without chlorine, Chorus T4218 gear oil additive package is a non-toxic, environment-friendly, multifunctional Extreme Pressure (EP) Gear Oil Additive Package with low odor. It's suitable for vehicle gear oils and industrial gear oils, which is a gear oil additive package for GL-4 and GL-5 different applications.
Through adjusting the formulation rate, it can satisfy the API GL-4 and GL-5 and moderate load application. With the advantages of one dosage has multi-functions, gear oil package T4218 simplify the inventory management and reduce the formulation cost. What's more, Chorus the vehicle gear oil (80W90) formulated by T4218 passed all the SwRI tests.
Chorus can also provide you with a low-dosage extreme-pressure additive package T4231 (SwRI Test Passed). Owing to its excellent bear, anti-wear and anti-oxidation performance, T4231 can help vehicles reduce gear friction and wear to improve the transmission efficiency and prolong the gear pieces' life. T4231 gear oil additive package also has the features of anti-corrosion and anti-rust.
With the low dosage, T4231 can realize the excellent performance and provide a reliable solution for gear oil's formulation and high efficient application.
In addition, Chorus can provide you with CP compound worm gear oil additive package T4312 to improve the gear oil extreme pressure and anti-wear performance and prolong the device's life.
Contact us to get TDS and other test dates.
