synthetic trans fluid
Has anyone ever switched their trans fluid over the pure synthetic like (royal purple) why would you do this or why not? thank you
Forum Discussion
Ozlander wrote:Charlie D. wrote:
Although Dexron VI is a tremendous fluid it is a synthetic blend.
Not if you use Valvoline DEXRON-VI Full-Synthetic Automatic Transmission Fluid.
You are correct and I knew about Valvoline. A number of people have made blanket statements that Dexron VI is synthetic which is not the case. When researching what synthetic to use in my previous truck I found the Transynd which is made by Castrol and IIRC, was the only true ATF synthetic at that time, Along with Valvoline there may be other brands but I have not researched it.
Neither Amsoil nor Royal Purple are on the Allison approval list. GM may approve them.
I just "bumped" the following from the Class A forum: "Let Me Know if You Have Allison Transmission Fluid Questions"
