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Differential oil (gear oil) lubricates the gears and bearings in the differential, transferring engine power to the driven wheels. Neglected differential oil degrades, causing increased wear, noise, and eventual gear failure. Regular replacement at the manufacturer's interval extends differential life and ensures smooth, quiet operation.
Differential oil breaks down over time due to heat, shear forces, and metal particle contamination. It is often overlooked in service schedules but is critical for drivetrain longevity.
Using the wrong oil specification can damage the differential. Limited-slip differentials (LSD) require specific friction-modified oil.


Commonly searched OE numbers fitting Axle Oil from the TecDoc catalogue.