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    About Differential and Gear Oil Replacement

    What does the differential and fluid do? The differential is a component in all vehicles and is designed to compensate for the difference in distance between the inner wheels and outer wheels travel as the car goes around a corner. In a rear-wheel-drive car, the differential has its own housing and lubrication, a thick, dark oil. Front-drivers typically integrate the differential in the transmission housing and share the same fluid. The differential oil lubricates the ring and pinion gears that transfer power from the driveshaft to the wheel axles. If your car is fitted with a limited-slip differential, it also keeps all the moving parts in that assembly healthy. A differential allows your car to make corners without drama. If both drive wheels rotated together, they'd jump-skitter because the outside tire travels farther than the inside. There are many variations on the design, but they fall into three categories: open, limited-slip, and torque-vectoring. Open: The oldest type of differential. Its simple, rugged design is widely used. The powered pinion gear meshes with the ring gear, which in turn transmits power to both axles through a second set of Œgears. When slippage occurs, power is directed to the wheel with the least grip. Limited-Slip: To overcome this problem, a clutch system is installed into the differential. The action of the mechanism locks the left and right-side axles together if wheel slip happens.,Torque-Vectoring, this is the latest and greatest type of differential. This design employs the full array of sensors in a car to determine which wheel should be getting the most power and uses electronic controls and clutches to direct it there How important is having your differential fluid changed? Changing the differential fluid is just as important as changing your engine's motor oil, and for the same reason. Metal-to-metal contact wears down surfaces and creates heat from friction, which inevitably weakens the gears and leads to failure.,Changing the differential fluid is one of the most-overlooked maintenance tasks on non-FWD light trucks, SUVs, and passenger vehicles. Because the differential is at the rear and under the vehicle, it gets none of the star treatment that the engine up front does. However, if lubrication in the differential fails, you won't be getting very far for very long. Fortunately, you only need to change this oil every 48,000 to 90,000 kms


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