Transmission oil change due to time?

et2 wrote:
It's called a baseline. It's put their by the manufacture based off criteria their engineers determined. I have no reason to question it. Particularly since my rig is new. I will follow the recommendation by what's called out by the manufacture.

Sure if you're rolling in cash, or just don't trust the manual, or you have more experience than the guys who've done designed the transmission, do what you want.

However when asked ... the manual would be my place for reference compared to what some guy said on the Internet.

Is not a baseline. Ford decided to come up with a tire size that there was only 1 manufacturer when they did the redesigned of the F series in the early 2000s. Do you know how much was Ford paying for tires? $0.
The Japanese invented the 0W20 bracket in oil justifying it would save gas, when in reality, for the first 3 years, there was only 1 manufacturer that could do 0w20. Do you know how much Toyota was paying for oil? $0
Much closer to us, the goverment set laws to increase MPG to 40 by 2020. Strangely enough, at the same time, they reduced the emission of sulfur to 15ppm, effectivelly increasing diesel consumption by 10% slowly as diesel engines with particle filtration get in service. Ever wonder why? There is no proof that a reduction of sulfur from 150 to 15ppm has any effect in the environment. Easy, Oil industry said they would need a way to make up their losses due to the 40mpg regulation.
You follow the manual because is new or have a warranty, I agree 100%.
If you had read my post, I don't pretend to know more than the designers, I know how deals are made when manuals are written.
An example, do you really think that the Transynd is that much better than the other trans fluid as to charge 3 times as much? It is made by Castrol for god sakes. Don't drink the koolaid just because the manual tells you, that is my only point.