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Also I have had no luck finding 10wt oil. Much less 10wt with a C4 specification.

I have owned 12 939A2 trucks and still have five. Three trucks were completely drained of all fluids. Of the trucks that had fluid in the transmissions I was never sure of what was in them other than that it wasnt Dexron III. I would like to continue using whatever was already in the...

Allison's own manual includes 15W40 right along with 10W and Dexron III. If oils other than Dexron III were the cause of vastly shortened life I dont think Allison would be recommending them. For operations in temps below 5F Dexron III is a better choice than 15W40 due to the 20 minute warm up...

If you get a truck that has dexron III in it you can continue using it or just drain the tranny and refill with 15W40. No need to flush as the Dexron will mix with anything and the transmission will not care.

I bought three trucks from Ft Hood that were completely drained. Normally I run 15W40 in the tranny but I decided to experiment with a NAPA heavy duty tractor and hydraulic transmission oil in the M934A2. Its basically a 15 weight oil. Well I cant tell any difference at all. I would stick with...