As a general rule of thumb, we recommend flushing your transmission fluid every 2 years or 30,000 miles. By having the fluid changed at this interval, you are helping it provide optimal protection of the internal components of the transmission, decreasing your odds of having premature transmission failure.
Regularly changing your transmission fluid makes your transmission last longer.
Now, there are some cars, like ones equipped with a CVT transmission, that have to be serviced in a very particular way, and usually not as frequently as every 2 years. So there are exceptions to the rule. But if you're not sure when it was last done, or if you've even had it done at all, it never hurts to get a mechanic's opinion just to be safe. Stop by anytime and we'll check the quality of your fluid for no charge.