It is recommended that you service your transmission as part of your regular maintenance schedule. Oftentimes, transmissions are overlooked because they aren’t considered important. Unfortunately, this is not the case; fluids need to be changed regularly to ensure that the transmission will function properly.
Although every car is different, it’s recommended to change your transmission oil every 40,000 kilometres. A car that is regularly driven with heavy loads can prematurely wear its transmission, so it should be serviced more often.