When is it advised to downshift an automatic transmission?

Downshifting in an automatic transmission is recommended when going down grades due to the need for engine braking. When a vehicle travels downhill, gravity pulls it forward, which can lead to higher speeds that may be difficult to control. By downshifting, the driver utilizes the engine's resistance to slow down the vehicle, helping to maintain a safe speed and reduce the reliance on the brakes. This practice helps prevent brake overheating and extends the life of the braking system, as brakes can wear out faster when they are overused.

While there are situations in which downshifting might be beneficial, such as when climbing hills (which increases engine load and might require more power), the most effective use of downshifting to manage speed and enhance control occurs during descents.