In the older models of transmissions however, it is required to change the fluid at the intervals specified by the original manufacturer of the vehicle. Usually the standard is replacing the full amount of fluid along with the filter every 40000 miles, and after that do the partial replacing every 12000 miles by draining the fluid from the transmission tray found at the bottom of your vehicle. It is also important to know that the changing procedure is quite different from changing engine oil, and is not simply drain&refill operation. If you think its time to change transmission fluid on your vehicle, you should contact a local certified auto shop that has all the neccessary tools and knows the proper procedure.

There is another theory that if you weren’t changing transmission fluid regularly, then you shouldn’t change it at all. There were a few cases when new transmission fluid caused the vehicle to stop operating, which was likely caused by an entirely new consistence of the fluid which led to flowing of old particle build-ups and blocking inner channels. Though this is a theory, it is definetely something to keep in mind.