Transmission oil change due to time?

map40 wrote:

et2 wrote:
I believe much of what you say is frabrication and without facts, merely opinion. Purchasing is a procurement element of a company. Not a policy or warranty implementer.

You throw out a lot of general comments that don't mean much of anything or follow any rational thought in regards to the original question that was asked. Just a bunch of straw men arguments.

That's a pretty naive comment. I witnessed negotiations in which an automaker would specify a particular tire size in exchange for a ridiculously low purchase price.
All decided by purchasing.
To your original question, why people don't just follow the manual, the answer is because some of us know how the manuals are written.

Well that about sums it up for me. I'm glad there's actual printed documents based on real life cycle testing, failure analysis and cost analysis. Easy for the person seeking a educated simple answer.

If that makes me naive, so be it. There's nothing you posted that means anything to someone that can see thru the smoke screen.

So I say it again. There's pleanty of actual documented data gathered by various methods, testing, design, and engineering principles that go into making a transmission.

So you want to tell everyone after all the money invested into design, manufacturing and testing that goes into a final product .... That the purchasing guy and the lawyers are writing the manuals. No I'm not naive ...