In my opinion, it's not necessary. ATF is dark which means ATF have done its job to clean the transmission. (ATF could become dark even after just several months' usages)
These transmissions are very reliable. With some ATF changes on them, they will not only be reliable, but also keep performing like new conditions!!!



Of course, if you keep pushing these cars to the limits, you better change ALL THE FLUIDS(not only ATF) more often!!!


























































































