What issue arises from having a high oil level in an automatic transmission?

A high oil level in an automatic transmission can indeed lead to delayed shifting from neutral to drive or reverse. When the transmission is overfilled with fluid, it can create excessive pressure within the system. This pressure can cause the transmission fluid to foam, which negatively impacts its ability to lubricate and engage the internal components properly. As a result, the hydraulic pressure that is necessary for smooth transitions between gears may be disrupted, leading to hesitation or delays when attempting to shift.

In addition, a high oil level may prevent the proper functioning of the fluid management system, further compounding shifting problems. This is why it's crucial to ensure that the transmission is filled to the manufacturer's specified level to maintain optimal performance and responsiveness.