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We used to put ATF in 5 ton military cargo trucks when that was all we had on hand (Cummins). And we put motor oil in the auto transmissions (Allisons). And a couple times had to substitute mineral oil cause we ran dry and it got us going for a week. For a time all the cargo fleet used ONLY 30w oil in everything on the trucks.
I say this because we were taught all these lubes have similar base composition and will interchange. An expert could be found- I'm sure - that would say no harm done.
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