Transmission oil change due to time?

et2 wrote:
For the record there's nothing factual from your "facts". If so you would be directing us the the supporting information in regards to how it relates to this specific conversation and I assume the Allison transmission. And if you think a engineer is just going to ask a purchasing guy how long, he probably isn't worth is weight in beans.


Who's complaining?

Again there's a wealth of information in the Allsion manuals that I've seen. From required maintenance to fluid recommendations ( both Transynd or not), to programming, fault codes, transmission health prognostics and codes, trouble shooting, different drive modes, shift patterns, etc,etc . Newer transmissions these days will tell you more by pressing two buttons compared to suggestions from some guy on the Internet.

So sorry if I don't buy the purchasing guy and bean counters are calling the shots when they put these things together.

You should spend some time reading before answering. Who is complaining? You. The first sentence you wrote.
No engineer would ever ask purchasing anything. Purchasing will tell the the guy writing the manual or the spec what to write. Unless the engineer can prove that is detrimental, what purchasing says go.
Weather you buy it or not, your choice. I was explaining you how that world works. The facts I gave you are not difficult to find or poorly documented. But of course, if you know enough to not even consider that there might be something you don't know, feel free to ignore what other people say. I much rather listen and make up my own mind after researching, mainly because I know I don't know much. But that's just me, you keep on wondering why people don't just blindly follow the manuals.
Have fun.