Do I need to shift to N gear when using auto hold at a red light?

[MaddoxLee]

When using auto hold for a short red light, keeping the gear in D is sufficient. For longer red lights, shifting to N gear is recommended. Here are the advantages of shifting to N gear: 1. Fuel savings: When shifting from N to D, the engine speed undergoes a process of first decreasing and then recovering. This occurs because after shifting to D, the engine attempts to move the car forward, but since the brake pedal is pressed, the car cannot move. All the engine's input energy is consumed by the torque converter, causing the engine speed to drop below idle. The engine control unit then injects more fuel, leading to increased fuel consumption. 2. Protects the torque converter: When parked in D gear, all the engine's output energy is consumed by the torque converter, raising its temperature and degrading the fluid quality, which shortens its lifespan.