What gear selector position is typically used when checking the fluid level in an automatic transmission with a dipstick?

The gear selector position that is typically used when checking the fluid level in an automatic transmission with a dipstick is Park. This position is essential because it ensures that the transmission is in a stable state that allows for an accurate measurement of the fluid level. When the vehicle is in Park, the transmission is not engaged, preventing fluid from being forced into areas where it might lead to an inaccurate reading.

Additionally, being in Park allows the engine to run while checking the fluid level, which is often recommended by manufacturers. This is important because transmission fluid expands and contracts with temperature, and checking the fluid while the engine is warm can provide a more accurate indication of the level as it reflects the fluid’s operating conditions within the transmission. Other positions such as Drive, Neutral, or Reverse could potentially lead to fluid being inaccurately distributed within the system, resulting in misleading fluid level readings.