Transmissiooniõli

Transmissiooniõli, often referred to as gear oil, is a specialized lubricant designed for use in manual transmissions, differentials, and other gearboxes in vehicles and machinery. Its primary function is to reduce friction and wear between moving gear teeth, ensuring smooth operation and prolonging the lifespan of these components.

Unlike engine oil, transmission oil is formulated to withstand extreme pressures and shear forces that occur within gear systems. It typically contains additives such as extreme pressure (EP) agents, anti-wear additives, and friction modifiers to protect the gears under high loads. The viscosity of transmission oil is also crucial, as it needs to be thick enough to maintain a protective film between gear surfaces but fluid enough to flow and lubricate effectively.

Different types of transmissions require specific formulations of transmission oil. Manual transmissions often use gear oils with EP additives to handle the heavy loads on gears. Automatic transmissions use automatic transmission fluid (ATF), which is a more complex hydraulic fluid that also serves as a lubricant and contains friction modifiers to control clutch engagement. Limited-slip differentials may require specialized oil with friction modifiers to prevent chatter.

Regularly checking and changing transmission oil according to the manufacturer's recommendations is essential for maintaining the health of the drivetrain. Contaminated or degraded transmission oil can lead to increased wear, premature failure of gears, and costly repairs.