Suburban Dude

Just changed the transfer case fluid in my 2008 3/4 ton Suburban with Autotrack. Even though my my owners manual asks for Dextron VI the chev dealers are telling me it needs Autotrak II. It is an Auto transfer case and has the Auto button on the control **** including Auto, 4H, 2H and 4L. I’m including a shot showing the blue color, the reason it’s nicknamed
Smurf Oil.

SD