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#4612404 - 12/23/17 05:48 PM Rotella 15w40 for Allison trans
Ursatdx Offline


Registered: 11/01/11
Posts: 132
Loc: New Jersey
New to me 1993 AMG M35A3
Allison trans currently has Rotella 15w40 for ATF.
Any thoughts on this or changing to another ATF would be appreciated.
Merry Xmas.

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#4612407 - 12/23/17 05:53 PM Re: Rotella 15w40 for Allison trans [Re: Ursatdx]
Chris142 Offline


Registered: 06/05/03
Posts: 16835
Loc: Deplorable in apple valley, ca
A lot of hd transmissions use motor oil. Leave it.
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02 Wrangler durablend 10w40
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Z400 castrol T 10w40
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#4612422 - 12/23/17 06:14 PM Re: Rotella 15w40 for Allison trans [Re: Ursatdx]
FirstNissan Offline


Registered: 12/05/10
Posts: 929
Loc: KY
That thing is awesome! Whats you plan of use for it? farm work or just for car shows?
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#4612430 - 12/23/17 06:21 PM Re: Rotella 15w40 for Allison trans [Re: Ursatdx]
2004tdigls Offline


Registered: 10/31/11
Posts: 484
Loc: maple ridge, bc

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#4612434 - 12/23/17 06:29 PM Re: Rotella 15w40 for Allison trans [Re: Ursatdx]
skyactiv Offline


Registered: 03/02/13
Posts: 4405
Loc: The Midwest
I'm a semi mechanic at UPS. The spotter trucks that all have an Allison automatic called for a 15W40 engine oil
up until about 12 years ago. Those transmissions hold up fine on it pulling semi trailers around the lot.
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#4612481 - 12/23/17 07:31 PM Re: Rotella 15w40 for Allison trans [Re: 2004tdigls]
PiperOne Offline


Registered: 10/25/17
Posts: 184
Loc: A Highway Near You


This is for manuals....not an Allison...ever.
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#4612496 - 12/23/17 07:51 PM Re: Rotella 15w40 for Allison trans [Re: PiperOne]
Miller88 Offline


Registered: 04/09/08
Posts: 12704
Loc: Onondaga County
Originally Posted By: PiperOne


This is for manuals....not an Allison...ever.


I don't know about the newer transmissions, but a lot of the older allisons could run hydraulic fluid , dex III ATF or 10w-30/15w-40 engine oil
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#4612524 - 12/23/17 08:34 PM Re: Rotella 15w40 for Allison trans [Re: PiperOne]
2004tdigls Offline


Registered: 10/31/11
Posts: 484
Loc: maple ridge, bc
yes, but if you check the OP he has rotella 15w40 in the allison right now??

most sae 50W oils are allison approved including this one:

https://www.fleetrite.com/parts/chemicals/transmission-fluid/fltl50wp


About Fleetrite Transmission Fluid

Navistar is excited to offer Fleetrite® synthetic automatic transmission fluid (ATF), a premium synthetic universal power shift and automatic transmission fluid that is TES-295approved for use in Allison transmissions. Fleetrite synthetic ATF is approved for Allison’s Extended Transmission Coverage Programs.




Edited by 2004tdigls (12/23/17 08:40 PM)

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#4612530 - 12/23/17 08:42 PM Re: Rotella 15w40 for Allison trans [Re: Ursatdx]
Linctex Online   content


Registered: 12/31/16
Posts: 6170
Loc: Waco, TX
Originally Posted By: Ursatdx

Allison trans currently has Rotella 15w40 for ATF.
Any thoughts on this or changing to another ATF would be appreciated.


Current fill will likely last the entire time you own the truck.

Does it use a spin on filter?
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#4613010 - 12/24/17 11:50 AM Re: Rotella 15w40 for Allison trans [Re: Ursatdx]
Ursatdx Offline


Registered: 11/01/11
Posts: 132
Loc: New Jersey
Thanks for the replies.
I'll look for the spin on filter.
The internal filter is identical to a TH400.
Thoughts on T6 in the engine?
Merry Christmas to all.

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#4625298 - 01/05/18 07:02 PM Re: Rotella 15w40 for Allison trans [Re: Ursatdx]
Ursatdx Offline


Registered: 11/01/11
Posts: 132
Loc: New Jersey
It does have the spin on filter.
It's very slow to shift when cold.
Then, again, everything is slow on this truck. Really like it. Rough ride, tough to steer, and brakes work great but you really have to stand on them.
It's a stinking blast to drive.
52-54 MPH tops.

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#4626346 - 01/06/18 08:05 PM Re: Rotella 15w40 for Allison trans [Re: Ursatdx]
nascarnation Offline


Registered: 04/30/04
Posts: 817
Loc: Indiana
For logistics purposes the US Army wanted to have a common engine and trans oil. The 15W40 was the diesel engine oil specified under MIL-L-2104D. So the trans was validated on both Dexron and engine oil. If you want better low temp performance, you could use a Dexron III spec oil or a 0W20 engine oil. 0W20 synthetic engine oil was the Army spec for engine and trans in arctic climate usage.

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