Why do you have to turn off the engine shift gears?

It is generally not necessary to turn off the engine to shift gears in most modern vehicles. Most modern cars have a transmission system that allows the driver to shift gears without turning off the engine. This system uses a variety of synchronizers and other mechanisms to ensure that the gears are engaged smoothly and without damage.

However, there are a few cases where it is necessary to turn off the engine before shifting gears. One such case is when the vehicle is in neutral and the transmission is in gear. In this situation, turning off the engine will disengage the transmission and allow the vehicle to be moved freely. Another case where it may be necessary to turn off the engine is when the vehicle is in gear and the transmission is not in neutral. In this situation, turning off the engine will prevent the vehicle from moving or the engine from being damaged.

It is always important to follow the instructions provided in the vehicle's owner's manual for specific information on when and how to shift gears.