75W-90 Gear Oils
Explore our premium 75W-90 synthetic gear oils, engineered for ultimate protection and smooth performance in transmissions and differentials.
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Eiffel synthetic oils offer superior protection with advanced formulations that provide better engine cleanliness, longer drain intervals, and enhanced performance in extreme temperatures compared to conventional oils.
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A Guide to 75W-90 Gear Oils
Your vehicle's gearbox and differential work under immense pressure and require a specialised lubricant to prevent wear and ensure smooth operation. 75W-90 is one of the most common and versatile high-performance gear oil grades available. Eiffel Lubricants offers advanced synthetic 75W-90 gear oils designed to provide superior protection for these critical components.
What Do the Numbers in 75W-90 Mean?
Just like engine oil, gear oil has a viscosity rating that tells you how it flows at different temperatures.
- 75W: The 'W' stands for 'Winter'. The number 75 indicates the oil's ability to flow at cold temperatures. A lower number means better flow, which helps to ensure smooth gear changes and proper lubrication on cold mornings.
- 90: This number represents the oil's viscosity at high operating temperatures. A 90-grade oil is designed to provide a thick, durable film of protection over gear teeth when they are under intense load and heat.
The Difference Between GL-4 and GL-5: Why It Matters
Choosing the right API service category is just as important as the viscosity. The two most common for 75W-90 oil are GL-4 and GL-5.
- API GL-4: This oil is designed specifically for manual transmissions and transaxles. It contains a balanced amount of extreme pressure (EP) additives that protect the gears without being harmful to the softer yellow metals, like the brass or bronze synchronizers found in many gearboxes.
- API GL-5: This oil is designed for hypoid gears, which are typically found in differentials. It contains a much higher concentration of EP additives to handle the extreme sliding pressures in a differential. Using a GL-5 oil in a gearbox that requires GL-4 can lead to damage of the synchronizers over time.
Key Benefits of a High-Quality 75W-90 Gear Oil
Using a premium synthetic 75W-90 oil helps ensure your drivetrain components are properly protected.
- Designed for Superior Wear Protection: It is engineered to form a strong film over gear teeth, protecting them from scoring and pitting under the high-torque conditions found in transmissions and differentials.
- Contributes to Smoother Shifting: The excellent cold-flow properties of a 75W-90 oil help to ensure easier and smoother gear engagement, especially in colder weather.
- Excellent Thermal Stability: A high-quality synthetic 75W-90 is designed to resist breaking down under high heat, which helps to extend the life of both the oil and the components it protects.
Always consult your vehicle's owner's manual for manufacturer-specific recommendations.
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