How should the transmission oil be checked?

Checking the transmission oil while the motor is running and the vehicle is in 'neutral' position is the correct method because this allows for the most accurate assessment of the transmission fluid level and condition. When the engine is running, the transmission pump circulates the fluid, which provides a more representative reading of the fluid level.

Positioning the vehicle in 'neutral' ensures that the transmission is not engaged, which is essential for safety and accuracy. The fluid level can then be checked against the dipstick marking, ensuring that it is within the proper range for optimal operation. This method prevents incorrect readings that could occur if the vehicle were in gear or if the engine were off, as the fluid would settle, leading to a false low reading.

Utilizing this procedure is critical for maintaining the performance and longevity of the transmission system, ensuring proper lubrication and hydraulic functions within the transmission.