Transmission fluid is anything but short-lived. In fact, compared to other automotive fluids, it’s designed to last for quite a long time. However, this isn’t to say that transmission fluid in Chicago has an infinite lifespan. It does wear down over time, and it does eventually need to be replaced with fresh fluid.
Generally, transmission fluid should last for between 30,000 and 60,000 miles of use. Once it hits this point, it gradually loses its efficacy.