[boomer]

I used the pan drop and refill method. Dexron VI is the fluid. There is a transmission filter to be replaced.

(174) 2007 Pontiac G6 Transmission fluid change - YouTube

 

[boomer]

I am not aware of a transmission fluid & filter service interval. I seem to recall GM labeled it a lifetime fluid, but I choose to ignore them and change it. I have done it at roughly 100k miles

 

[boomer]

You are correct, I just had not noticed the maintenance schedule

 

[boomer]

I will often try rockauto.com. They often have a broad range of options at reasonable prices