Allison 3000MH WTEC 3 electronic control system data

Call or email Allison, most of there stuff is online. There is very little to service on these other than filters and fluids. The service recommendations are very long but they do say 1 year or x miles. Otr trucks run 750,000 miles before service.
I'm one of those who's a big believer in oil analysis. For $25 you can get real insight into the transmissions condition.
I use Blackstone
Good luck