Quote Originally Posted by heavydutychevy View Post
Merc five lol yes there is such a thing its short for mercon V and its what the 06 uses
From the '06 Owners Manual: Part D Recommend Fluids and lubricants - Page 6-25:

Automatic Transaxle Use only T-IV Automatic Transmission Fluid (GM Part No. U.S. 88900925,
in Canada 22689186).

I use Valvoline Max Life on my Daughter's '06, which is one of several fluids meeting that spec.