How often should I change the transmission fluid on my Ford Focus?

I just bought a used Ford Focus and I'm not sure when the last time the previous owner changed the transmission fluid. I want to make sure I'm properly maintaining my car. How often should I change the transmission fluid on a Ford Focus?

Transmission fluid should be changed every 30,000 miles or every 2-3 years, whichever comes first.

I change my transmission fluid every 50,000 miles and have had no issues. It ultimately depends on your driving habits and the condition of your transmission.

I recommend changing your transmission fluid every 40,000 miles for optimal performance.