What are the rules of transmission oil change?
If the oil is not changed correctly and, first of all, IN TIME, it loses its properties. This means the cancellation of your transmission preservation warranty and its service life reduces considerably. As soon as the vehicle travels a specific distance indicated in the operation manual, the used oil should be replaced with new one. It is more difficult to change the transmission oil than the engine one; therefore, it is better to charge specialists with this operation.
Why is timely and qualified transmission oil change so critical? First, the oil should be changed mainly due to the loss of additive package performance. Additives lose their properties in time and stop fulfilling own functions. The oil starts foaming and this may cause the main gear tear. The consequences include tiresome humming of the gear differential in the transmission, which will increase and lead to the gear teeth destruction in 300–500 km of travel; this will be followed by the transmission jamming. This also happens in vehicles with 4 wheel and front drive. In vehicles with rear drive and mechanical shifting gearbox, the transmission is not exposed to temperature loads and the oil can be used 10–20 thousand km more, without losing its lubrication properties. Its change is usually associated with the oil change in the gearbox. This is made to remove particles of dirt and chips whic are generated as a result of gear operation and which exit the housing of the shifting gearbox together with the oil drained. To avoid this, the manufacturers recommend to implement the procedure for oil change in the transmission each 50–60 thousand km travelled. In case of hard drive “acceleration – braking”, the term of change is decreased to 30–40 thousand km travelled. These recommendations do not depend on the total value of the vehicle mileage. As the engine oil, the transmission oil should be changed: this allows optimizing operation of your vehicle and reducing wear of the transmission parts.