What period of time should you change transmission oil for automatic transmission?

It is recommended that you change the transmission oil for an automatic transmission every 30,000 to 60,000 miles, or every 2 years, whichever comes first. If your vehicle is driven in severe conditions, such as towing heavy loads or frequent stop-and-go traffic, you should change the transmission oil more frequently.

Here are some signs that your transmission oil may need to be changed:

* The transmission fluid is dark brown or black in color.

* The transmission fluid has a burnt smell.

* The transmission is slipping or shifting roughly.

* The transmission is making a humming or whining noise.

If you experience any of these symptoms, it is important to have your transmission fluid checked and changed if necessary.