Quote Originally Posted by _nick_ View Post
Royal purple will work fine, but its a waste...they all have to meet the same spec and they cant "exceed" that spec because essentially it will make the fluid too slippery and cause the trans to slip. So weather its cheap wal-mart oil or expensive novelty brands like royal purple/amsoil etc.. there not going to be a hell of a lot of difference if any (other than the fancy label)
A lot of these "specialty" oils that I talk about, and you mention (Amsoil, Royal Purple) do not call themselves Dexron VI or Mercron because they exceed the requirements for those fluids. They are mostly fully synthetic and will last much longer and work much better than regular fluid. But of course at a price.

But to make a comment that they are too slippery is crazy. Again, people need to make sure they know what they are talking about before hitting the post button.