What is the S gear in an automatic transmission?

[StLucille]

Automatic transmission S gear is the sport mode. When this gear is engaged, the gears can be freely switched, but the shifting timing is delayed, allowing the engine to maintain high RPM for a period of time to increase the car's power. The S gear only delays upshifting without changing other working aspects, which increases the transmission load and raises the temperature in a short time, leading to accelerated wear. Therefore, try not to use the S gear for extended periods. Cars that frequently drive in congested urban areas tend to accumulate more carbon deposits in the engine. Thus, using the S gear appropriately at regular intervals helps remove carbon deposits from the engine, improve fuel economy, and extend the engine's lifespan.