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Was in the Air Force for 20 years, as a Vehicle Mechanic. Most of the larger trucks that had Allison transmissions in them, used 10 Wt (Hydraulic oil). Never had any major failure that I can remember because of the fluid. I know it's not engine oil, but it's along the same lines with different characteristics.
Before the electronic controlled tranny era it was common to use 15W-40 or 30 motor oil in Allison trannys. It was Allison approved oil as long as it was classfied as a "C4" fluid.
MOPARTS ALERT!: Chris Pugh aka gabodyman of Dalton, Georgia, cashed my $140 money order on 4-16-02 never sent parts. On 3-19-07 he agreed to return my money; "april 9, it will be in the mail by that date""will do as promised. chris" Still no parts and no money!
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