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Old 08-26-2022, 04:14 PM   #1
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Does your Allison transmission use oil?

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.
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Old 08-26-2022, 06:59 PM   #2
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Location: Powell River, B.C.
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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 .
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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Old 08-26-2022, 07:26 PM   #3
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Transmissions don't use Oil. But they can leak.
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Old 08-27-2022, 02:11 PM   #4
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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.
Ray & Wendy
Full-time ... Finally!
2014 Anthem 42RBQ - 2018 Jeep Wrangler - FMCA F521969
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Old 08-27-2022, 08:30 PM   #5
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Spartan Chassis
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Location: Fort Worth
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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.
2004 38DS04 Travel Supreme
Cummins 8.3 ISC 350HP
Spartan Mountain Master
Ford Ranger Towed
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