redline synthetic mtl
 

i know that ford says to run atf in t5's, but i have been told that i can run redline synthetic mtl. and it will be fine and make shifting smoother... is any of this true? i was under the impression that the atf was needed because it was a lighter weight oil in order to properly lube the bearings. so in short is anyone using redline synthetic mtl.. or have any reasons why or why not to use it? thanks very much, Jason

My friend ran redline in his with no issues. He said the shifting was better. I run redline in my tremec. I have heard alot of good things about GM sycromesh fluid. I think I will try this spring since I am do for a fluid change.