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Someone on this forum (for all I know it was you ) posted images of the first test project/demo HMMWV. It had that Deutz air cooled engine. It was a much lighter concept vehicle.I have an oil cooled Deutz in my 863 skid loader. a very small 4 cyl. makes 73HP.
And no coolant per-say so no corrosion, I am impressed, the oil cooled do make more HP for a given size than the "air cooled" (they still have oil coolers that are very important)
Of course I have no knowledge of what they were stuffing in the HMMWV and the Deutz does not seem like a likely automotive engine, great as power units.