Does your Allison transmission use oil?

[swduns]

2008 Tiffin Phaeton, 40' DP Class A motorhome, ISC CM2150 8.3L 360HP, 22,000 odometer miles
I started full time at the beginning of 2022 and so far have traveled about 5000 miles this year.
I checked the transmission oil level cold once and it was full
I have not tried to check it via the shifter panel but I plan to
Over the 5000 miles, I haven't added any oil.
The engine and transmission are very clean and don't appear to leak any oil
I've never has a car transmission that used oil and I don't know what is normal for DPs.
Do allison transmission normally use a little oil?
What is normal?
In January I had the transmission oil checked and both filters changed.
I have annual service scheduled, so will be doing whatever needs to be done to it.

[Skip426]

In 12 years 50,000 miles , I haven't added any fluid to my 3000 series .

And you've just reminded me I'm due to service it .

[Mr Ted]

Transmissions don't use Oil. But they can leak.

[RayandWendy]

Automatic transmissions need to be checked at operating temperature while the engine is running. If it's full when cold it may not be the same at operating temperature.
Later...
Ray

[rag_ftw]

Six years and 28,000 miles since I changed to Transynd. I finally added 1 quart last week not because the xmsn used it but because I have a very minor drip in one of the connections on the hose going to the cooler.

I never check with the dipstick. I only use the shift pad. I check it in the evening just prior to shutting down.