I've seen this on other cars, never had an issue. It can be normal for the fluid to jump around in the reservoir. Unless what you're seeing is something really extreme, I wouldn't worry about it. Maybe post a video if you think it is. AT fluid loses viscosity fast as it heats up. If you're at an operating temp of say 180F then ATF is going to be pretty thin and easy to slosh around. I'd be more worried about leaks, weird noises, excess play, and steering feel/effort.
|