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Buy fully synthetic gear oil and gearbox oil at Opie Oils, suitable for manual transmissions, transfer cases, and differentials across a wide range of vehicles. Whether you need 75W90 fully synthetic gear oil or any other viscosity, our range includes high-quality options designed to deliver smooth shifting and long-lasting protection.
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99 Products (Viewing: 1 - 60 of 99)
If you're reasonably handy, replacing your vehicle’s gearbox oil is usually a straightforward task, often similar to changing engine oil. Regular maintenance helps ensure your transmission continues to operate efficiently and reliably.
Using a high-quality, fully synthetic gearbox oil is essential for protecting internal components, reducing wear on gear faces and teeth, and maintaining smooth gear changes. These advanced fluids are designed to perform under high pressure and temperature, helping to extend the life of your gearbox and differential.
Even if your vehicle manufacturer states the oil is “filled for life”, what they really mean is “filled for a long time”. All oils break down with time and use, so it is worth replacing the oil after a few years.
At Opie Oils, we stock a wide selection of fully synthetic 75W90 gear oil and other grades from top brands like Castrol, Millers Oils, Mobil, and more. You can be confident you’re choosing a high-quality oil designed for performance, making it easy to keep your drivetrain in top condition.
Browse our full range of fully synthetic gear oils today and keep your transmission running smoothly and efficiently.