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Funny enough the Allison op manual does define it, MIL-L-46167B.

That information is actually called out in the Allison operator's manual. It states pre-heating is required: SAE 0W-20: -22 oF Dexron III: -17 SAE 10W: -4 SAE 15W-40: 5 SAE 30: 32 SAE 40: 50

So for the person who was asking, Allison is going to tell you to use a C4 fluid if you call them (this is what they told me), for off-highway or severe-duty use, or, Transynd. Dexron 3 is an Allison C4 fluid but so are various heavy duty engine oils including Mobil. Also if you call an Allison...

I don't think the personal attack is really warranted, is it? The engine oil is fine. It's been fine in my truck and it's fine in the military trucks or they wouldn't be doing it - or having been doing it - as long as they have. Plus there are real advantages like it's cheap and you only have...

I'm one of the guys who would tell you to put motor oil back in it, the one you aren't supposed to listen to.

I had the lurching problem, thudding 3->2 shifts, and sometimes, it would fight the brakes at stops Stopping I looked like a teenager driving a garbage truck for the first time it would bounce so much. It got to the point where I would lift the pedal at stops. Before I got around to lubing...