Should I Use D+- Gear or S Gear for Automatic Transmission When Driving Uphill or Downhill?

[VonChristian]

For automatic transmission vehicles, the D+- gear is generally used for short and gentle slopes, while the S gear is suitable for long and steep slopes. Below are specific scenarios for using the S gear: 1. Overtaking: The S gear can instantly provide high torque, allowing the car to accelerate quickly in a short time. 2. Steep or long slopes: On steep and long slopes, using the S gear to downshift can utilize engine braking, reducing reliance solely on the brakes and enhancing driving safety. 3. Traffic congestion: The S gear can lock the gear in a lower position, minimizing wear and tear on the transmission caused by frequent gear shifts. 4. Carbon deposit cleaning: The S gear increases the engine load and raises its internal temperature, which helps in cleaning carbon deposits.