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· 07 Black GT Vert ♥
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From the 2007 G6 Owners Manual, Pg. 434-437.
At 50K, 100K, 150K miles the following transaxle service is listed:


2.4L (Code B) L4 and 3.5L (Code N) V6 Engines Only: Change automatic transaxle fluid and filter (severe service only). See footnote (h).

(h) Change automatic transaxle fluid and filter if the vehicle is mainly driven under one or more of these conditions:
− In heavy city traffic where the outside temperature regularly reaches 90°F 32°C) or higher.
− In hilly or mountainous terrain.
− When doing frequent trailer towing.
− Uses such as found in taxi, police, or delivery service.​
If you do not use your vehicle under any of these conditions, the fluid and filter do not require changing.​
The 3.9 engine has separate transaxle service requirements, see manual for more details.
Apparently GM does not always suggest the transaxle needs to be serviced!
 

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It's in everyone's best interest to change the transmission fluid and filter at the first 60K then 30K there after. Lexus made the same mistake, by telling owners that it's "lifetime fluid", and owners who bought the vehicles out instead of doing a lease return after a few years, found out the hardway that regular trans fluid changes were necessary as a new transmission for them ran $4-5K, all for $80 in fluid service every few years!

Look at it this way as an example:
Total transmission fluid capacity is say 14L.
Transmission service only dumps out about 50% of the fluid, or say 7L, as the rest remains in the non accessible parts.
When you change out the fluid at say 90K (30K after the first 60K service, the fluid that's been in there is already 50% used as you can't drain it all out. This is why after the first 60K, the fluid change intervals should be cut in half.

This can be somewhat solved by a transmission flush, which removes about 90% of the fluid, but in higher mileage vehicles, it can do more harm than good as the high pressure used to evacuate the fluid can dislodge particles trapping them in the valve body or other vital components which can lead to a rebuild. Not nice.

Best advice from me is first fluid change 60K, and 30-40K there after for maximum transmission life.
 
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