Okay heres the scoop. At 100k I want to flush my transmission fluid and replace it with fresh Amsoil Syn. (Will be done professionally.)

My question is.

I have been told many times by many people that flushing a transmission with that amount of miles on it, is bad for the trans.
I don't think that's true. I can't see how it is, but with the amount of people that have said that to me, I'm beginning to wonder if its true.


So is it a good idea to flush the fluid and replace with Amsoil (because I know how much our Trans.'s love that stuff.) Or should I just leave the fluid alone????


ps. the car's a '99 GTP with 99.6k on it.